RS-232/RS-485/422 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161 RS-232 RS-485/422 - Datasheet Archive

 

+3.0V to+5.5V, 1µA, RS-232/RS-485/422 Multiprotocol Transceivers The MAX3160/MAX3161/MAX3162 are programmable

 

19-1722; Rev 1; 3/06 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 are programmable RS-232/RS-485/422 RS-232/RS-485/422 multiprotocol transceivers. The MAX3160/MAX3161 MAX3160/MAX3161 are pin programmable as a 2TX/2RX RS-232 RS-232 interface or a single RS-485/422 RS-485/422 transceiver. The MAX3162 MAX3162 is configured as a 2TX/2RX RS-232 RS-232 interface and a single RS-485/422 RS-485/422 transceiver simultaneously. All devices incorporate a proprietary low-dropout transmitter output stage and an on-board dual charge pump to allow RS-232 RS-232 and RS-485/422 RS-485/422 compliant performance from a +3V to +5.5V supply. The receivers feature true fail-safe circuitry that guarantees a logichigh receiver output when the receiver inputs are open or shorted. These devices also feature pin-selectable transmitter slew rates for both RS-232 RS-232 and RS-485/422 RS-485/422 modes. Slew-rate limiting minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. Disabling slew-rate limiting allows these devices to transmit at data rates up to 10Mbps in RS-485/422 RS-485/422 mode and up to 1Mbps in RS-232 RS-232 mode. The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 feature a 1µA shutdown mode, and short-circuit limiting and thermal shutdown circuitry to protect against excessive power dissipation. Features Single-Supply Operation from +3V to +5.5V Pin-Programmable as 2TX/2RX RS-232 RS-232 or Single RS-485/422 RS-485/422 (MAX3160/MAX3161 MAX3160/MAX3161) 2TX/2RX RS-232 RS-232 and Single RS-485/422 RS-485/422 (MAX3162 MAX3162) Pin-Programmable RS-232/RS-485 RS-232/RS-485 Transmitter Slew Rates Reduce EMI 10Mbps RS-485 RS-485 and 1Mbps RS-232 RS-232 Data Rates Pin-Programmable Half-Duplex or Full-Duplex RS-485/422 RS-485/422 Operation (MAX3160/MAX3161 MAX3160/MAX3161) RS-485/422 RS-485/422 True Fail-Safe Receivers Transmitters and Receivers Protected Against Wiring Faults 1µA Shutdown Supply Current 1/8-Unit Load Allows up to 256 Transceivers on the Bus The MAX3160/MAX3162 MAX3160/MAX3162 offer a flow-through pinout that facilitates board layout. The MAX3160/MAX3161/ MAX3160/MAX3161/ MAX3162 MAX3162 are available in tiny SSOP packages and operate over the commercial and extended temperature ranges. Typical Operating Circuit _Applications Point-of-Sales Equipment Peripherals Industrial Controls Networking +3V TO +5.5V 1 RS-232 RS-232 to RS-485 RS-485 Interface Converters DB9 VCC RS485/RS232 RS485/RS232 11 TEMP RANGE 0°C to +70°C PIN-PACKAGE 20 SSOP MAX3160EAP MAX3160EAP -40°C to +85°C 0°C to +70°C 24 SSOP MAX3161EAG MAX3161EAG -40°C to +85°C 24 SSOP MAX3162CAI MAX3162CAI 0°C to +70°C -40°C to +85°C 5 Y(A)/T2OUT 28 SSOP MAX3160 MAX3160 28 SSOP MAX3162EAI MAX3162EAI 13 20 SSOP MAX3161CAG MAX3161CAG Z(B)/T1OUT 16 RTS DE/T2IN TX Ordering Information PART MAX3160CAP MAX3160CAP DI/T1IN 6 A/R2IN MAX3100 MAX3100 11 15 RX RO/R2OUT 8 12 CTS R1OUT 10 13 B/R1IN 7 14 GND FAST HDPLX SHDN SPI µP 4 10 12 9 RJ45 SHDN Pin Configurations appear at end of data sheet. Selector Guide appears at end of data sheet. _ Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 General Description MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers ABSOLUTE MAXIMUM RATINGS VCC to GND. .-0.3V to +6V V+ to GND .-0.3V to +7V V- to GND.0.3V to -7V V+ - V- (Note 1).+13V Input Voltages T1IN, T2IN, DI, DE485 DE485, RE485 RE485, TE232 TE232, RE232 RE232, SHDN, FAST, HDPLX, RS485/RS232 RS485/RS232 to GND. .-0.3V to +6V A, B, R1IN, R2IN to GND .±25V Output Voltages T1OUT, T2OUT, Y, Z to GND.±13.2V R2OUT, R1OUT, RO to GND.-0.3V to (VCC + 0.3V) Output Short-Circuit Duration T1OUT, T2OUT, Y, Z .Continuous Continuous Power Dissipation (TA = +70°C) 20-Pin SSOP (derate 9.1W/°C above +70°C) .728mW 24-Pin SSOP (derate 9.5W/°C above +70°C) .760mW 28-Pin SSOP (derate 10.8W/°C above +70°C) .864mW Operating Temperature Ranges MAX316 MAX316_CA_ .0°C to +70°C MAX316 MAX316_EA_ .-40°C to +85°C Storage Temperature Range .-65°C to +150°C Junction Temperature .+150°C Lead Temperature (soldering, 10s) .+300°C Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = +3V to +5.5V, C1­C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER DC CHARACTERISTICS VCC Shutdown Current ICC MAX 1.2 2.5 MAX3160/MAX3161 MAX3160/MAX3161, no load, RS485/ RS485/ RS232 RS232 = VCC 2.5 5.5 MAX3162 MAX3162 No Load ICC TYP MAX3160/MAX3161 MAX3160/MAX3161, no load, RS485/ RS485/ RS232 RS232 = GND VCC Standby Current SYMBOL CONDITIONS MIN 3.0 6 1 10 SHDN = GND, receiver inputs open or grounded UNITS mA µA R TRANSMITTER AND LOGIC INPUTS (DI, T1IN, T2IN, DE485 DE485, RE48 5, TE232 TE232, R E 2 32 , FAST, HDPLX, SHDN, RS485/R RS485/R S2 32) Logic Input Low Logic Input High VIL VIH 0.8 VCC = +3.3V 2.0 VCC = +5V 2.4 V V Logic Input Leakage Current IINL ±0.01 Transmitter Logic Hysteresis VHYS 0.5 ±1 µA V RS-232 RS-232 AND RS-485/422 RS-485/422 RECEIVER OUTPUTS (R1OUT, R2OUT, RO) Receiver Output Voltage Low VOL IOUT = 2.5mA Receiver Output Voltage High VOH IOUT = -1.5mA Receiver Output Short Circuit Current IOSR 0 < VO < VCC Receiver Output Leakage Current IOZR Receivers disabled 2 0.4 VCC - 0.6 V V ±20 ±60 mA ±0.05 ±1 µA _ +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers (VCC = +3V to +5.5V, C1­C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL RS-232 RS-232 RECEIVER INPUTS (R1IN, R2IN) CONDITIONS MIN Input Voltage Range TYP V 0.6 VCC = +5V Input Threshold Low UNITS 25 -25 VCC = +3.3V MAX 0.8 V VCC =+3.3V 2.0 VCC = +5V Input Threshold High 2.4 Input Hysteresis 0.5 Input Resistance 3 5 V V 7 k RS-485/422 RS-485/422 RECEIVER INPUTS (NOTE 2) MAX3160 MAX3160 Input Resistance RIN -7V < VCM < +12V MAX3160 MAX3160 Input Current IIN MAX3161/MAX3162 MAX3161/MAX3162 Input Differential Threshold 48 MAX3161/ MAX3161/ MAX3162 MAX3162 96 VCM = +12V 0.25 VCM = -7V -0.15 VCM = +12V 0.125 VCM = -7V VTH -0.075 -50 -200 VTH Input Hysteresis k mA mV 30 mV V RS-232 RS-232 TRANSMITTER OUTPUTS (T1OUT, T2OUT) Both transmitter outputs loaded with 3k to GND ±5 ±5.4 Output Resistance VCC = V+ = V- = 0, T_OUT = +2V 300 10M Output Short-Circuit Current T_OUT = GND Output Leakage Current VOUT = ±12V TE232 TE232 = GND or SHDN = GND Output Voltage Swing ±30 ±60 MAX3160/ MAX3160/ MAX3161 MAX3161 ±125 MAX3162 MAX3162 mA ±25 µA RS-485/422 RS-485/422 TRANSMITTER OUTPUTS (Y, Z) R = 27 (RS-485 RS-485) Differential Output Voltage VOD 1.5 R = 50 (RS-422 RS-422) 2 V Figure 1 Change in Magnitude of Differential Output Voltage for Complementary Output States VOD R = 27 or 50, Figure 1 Common Mode Output Voltage VOC Change in Magnitude of Common Mode Output Voltage for Complementary Output States VOC -0.2 0.2 V R = 27 or 50, Figure 1 3 V R = 27 or 50, Figure 1 0.2 V _ 3 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 ELECTRICAL CHARACTERISTICS (continued) MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers ELECTRICAL CHARACTERISTICS (continued) (VCC = +3V to +5.5V, C1­C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Output Short-Circuit Current Output Leakage Current SYMBOL ISC IO CONDITIONS VY or VZ = +12V to ­7V VY or VZ = +12V, DE485 DE485 = GND or SHDN = GND MIN TYP MAX ±250 MAX3160/ MAX3160/ MAX3161 MAX3161 ±125 MAX3162 MAX3162 UNITS mA ±25 µA RS-232 RS-232 TIMING CHARACTERISTICS (FAST = GND, 250kbps, ONE TRANSMITTER SWITCHING) Maximum Data Rate RL = 3k, CL = 1000pF Receiver Propagation Delay R_IN to R_OUT, CL = 150pF 250 kbps 0.15 µs Receiver Output Enable Time 200 ns Receiver Output Disable Time 200 ns 100 ns 50 ns Transmitter Skew |tPHL - tPLH| Receiver Skew |tPLH - tPHL| VCC = +3.3V, TA = +25°C, RL =3k to 7k, measured from +3.0V or ­3.0V to +3.0V Transition-Region Slew Rate CL = 150pF to 1000pF 6 30 CL = 150pF to 2500pF 4 30 V/µs RS-232 RS-232 TIMING CHARACTERISTICS (FAST = VCC, 1Mbps, ONE TRANSMITTER SWITCHING) VCC = +3V to +4.5V, RL = 3k, CL = 250pF 1 Maximum Data Rate VCC = +4.5V to +5.5V, RL = 3k, CL = 1000pF 1 Receiver Propagation Delay R_IN to R_OUT, CL = 150pF Mbps 0.15 µs Receiver Output Enable Time 200 ns Receiver Output Disable Time 200 ns Transmitter Skew |tPHL - tPLH| 25 ns Receiver Skew |tPLH - tPHL| 50 ns Transition-Region Slew Rate VCC = +3.3V, TA = +25°C, RL =3k to 7k, CL = 150pF to 1000pF, measured from +3.0V or ­3.0V to +3.0V 24 150 V/µs RS-485/422 RS-485/422 TIMING CHARACTERISTICS (FAST = GND) 250kbps Driver Propagation Delay tDPHL, tDPLH RDIFF = 54, CL = 50pF, Figures 3, 5 200 400 800 ns Driver Rise and Fall Time tDPHL, tDPLH RDIFF = 54, CL = 50pF, Figures 3, 5 200 400 800 ns Driver Propagation Delay Skew tDSKEW RDIFF = 54, CL = 50pF, Figure 3, 5 200 ns Driver Output Enable Time tDZH, tRZL RDIFF = 54, CL = 50pF, Figures 4, 6 400 800 ns Driver Output Disable Time tDLZ, tDHZ RDIFF = 54, CL = 50pF, Figure 4, 6 200 400 ns Receiver Propagation Delay tRPLH, tRPHL CL = 15pF, Figures 7, 9 80 150 ns Receiver Propagation Delay Skew tRSKEW CL = 50pF, Figures 7, 9 10 ns 4 25 _ +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers (VCC = +3V to +5.5V, C1­C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Receiver Output Enable Time SYMBOL tRZL, tRZH CONDITIONS CL = 50pF, Figures 2, 8 Receiver Output Disable Time tRLZ, tRHZ MIN TYP 100 CL = 50pF, Figures 2, 8 MAX UNITS ns 100 ns RS-485/RS-422 RS-485/RS-422 TIMING CHARACTERISTICS (FAST = VCC, 10Mbps) Driver Propagation Delay tDPHL, tDPLH RDIFF = 54, CL = 50pF, Figures 3, 5 60 120 ns Driver Rise And Fall Times tDR, tDF RDIFF = 54, CL = 50pF, Figures 3, 5 10 25 ns Driver Propagation Delay Skew tDSKEW RDIFF = 54, CL = 50pF, Figures 3, 5 10 ns tDZL tDLZ, tDHZ tRPLH, tRPHL RDIFF = 54, CL = 50pF, Figures 4, 6 400 800 ns RDIFF = 54, CL = 50pF, Figures 4, 6 200 400 ns CL = 15pF, Figures 7, 9 80 150 ns 10 ns Driver Output Enable Time Driver Output Disable Time Receiver Propagation Delay Receiver Propagation Delay Skew Receiver Output Enable Time Receiver Output Disable Time tRSKEW CL = 50pF, Figures 7, 9 tRZL, tRZH tRLZ, tRHZ CL = 50pF, Figures 2, 8 CL = 15pF, Figures 2, 8 100 100 ns ns Note 2: Applies to A, B for MAX3162 MAX3162 and MAX3160/MAX3161 MAX3160/MAX3161 with HDPLX = GND, or Y, Z for MAX3160/MAX3161 MAX3160/MAX3161 with HDPLX = VCC. Typical Operating Characteristics (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all RS-232 RS-232 transmitters (RS-232 RS-232 mode) loaded with 3k to ground, TA = +25°C, unless otherwise noted.) 2.5 0 -2.5 -5.0 -7.5 -10.0 7.5 5.0 2.5 0 -2.5 1000 2000 3000 4000 LOAD CAPACITANCE (pF) 5000 14 12 10 8 6 -5.0 4 -7.5 2 0 -10.0 0 16 SLEW RATE (V/µs) 5.0 18 MAX3160/2 MAX3160/2 TOC2 7.5 10.0 TRANSMITTER OUTPUT VOLTAGE (V) MAX3160/2 MAX3160/2 TOC1 TRANSMITTER OUTPUT VOLTAGE (V) 10.0 RS-232 RS-232 TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE (FAST = GND) RS-232 RS-232 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (FAST = VCC) MAX3160/2 MAX3160/2 TOC3 RS-232 RS-232 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (FAST = GND) 0 500 1000 1500 LOAD CAPACITANCE (pF) 2000 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF) _ 5 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all RS-232 RS-232 transmitters (RS-232 RS-232 mode) loaded with 3k to ground, TA = +25°C, unless otherwise noted.) OPERATING SUPPLY CURRENT vs. MAX3160/MAX3161 MAX3160/MAX3161 RS-232 RS-232 TRANSMITTER SLEW RATE LOAD CAPACITANCE WHEN NO-LOAD SUPPLY CURRENT vs. vs. LOAD CAPACITANCE (FAST = VCC) TRANSMITTING DATA (RS-232 RS-232 MODE) TEMPERATURE 60 50 40 30 20 1Mbps 2.5 SUPPLY CURRENT (mA) 70 40 250kbps 30 20 20kbps MAX3160/2 MAX3160/2 TOC6 50 SUPPLY CURRENT (mA) 80 3.0 MAX3160/2 MAX3160/2 TOC5 90 SLEW RATE (V/µs) 60 MAX3160/2 MAX3160/2 TOC4 100 RS-485 RS-485 MODE 2.0 1.5 RS-232 RS-232 MODE 1.0 10 10 0 0 0 500 1000 1500 0 0 2000 1000 2000 3000 4000 5000 -40 -15 10 35 60 85 LOAD CAPACITANCE (pF) LOAD CAPACITANCE (pF) TEMPERATURE (°C) SHUTDOWN CURRENT vs. TEMPERATURE RS-485/422 RS-485/422 OUTPUT CURRENT vs. DRIVER OUTPUT VOLTAGE RS-485/422 RS-485/422 OUTPUT CURRENT vs. DRIVER OUTPUT HIGH VOLTAGE 100 80 60 40 100 80 60 40 MAX3160/2 MAX3160/2 TOC9 160 OUTPUT CURRENT (mA) 120 OUTPUT CURRENT (mA) 120 180 MAX3160/2 MAX3160/2 TOC8 140 SHUTDOWN CURRENT (nA) 140 MAX3160/2 MAX3160/2 TOC7 160 140 120 100 80 60 40 20 20 0 0 -40 -15 10 35 60 85 20 0 0 2 4 6 8 10 12 -7 -5 -3 -1 1 3 TEMPERATURE (°C) OUTPUT LOW VOLTAGE (V) RS-485/422 RS-485/422 DRIVER DIFFERENTIAL OUTPUT vs. TEMPERATURE 5 OUTPUT HIGH VOLTAGE (V) RS-485/422 RS-485/422 DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE OUTPUT CURRENT vs. RECEIVER OUTPUT LOW VOLTAGE 0.1 3.2 3.1 3.0 2.9 2.8 2.7 0.01 MAX3160/2 MAX3160/2 TOC12 3.3 30 25 OUTPUT CURRENT (mA) 1 R = 50 3.4 OUTPUT VOLTAGE (V) 10 MAX3160/2 MAX3160/2 TOC11 3.5 MAX3160/2 MAX3160/2 TOC10 100 OUTPUT CURRENT (mA) MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers 20 15 10 5 2.6 2.5 0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V) 6 3.5 4.0 0 -40 -15 10 35 TEMPERATURE (°C) 60 85 0 0.5 1.0 1.5 2.0 2.5 OUTPUT LOW VOLTAGE (V) _ 3.0 3.5 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers 10 8 6 4 100 RISING 80 FALLING 60 40 20 2 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 R = 50 80 75 70 65 60 55 0 0 85 MAX3160/2 MAX3160/2 TOC18 CL = 50pF RS-485/422 RS-485/422 DRIVER PROPAGATION DELAY vs.TEMPERATURE (FAST) SUPPLY CURRENT (mA) OUTPUT CURRENT (mA) 12 120 PROPAGATION DELAY (ns) MAX3160/2 MAX3160/2 TOC13 14 MAX3160/2 MAX3160/2 TOC16 RS-485/422 RS-485/422 RECEIVER PROPAGATION DELAY vs. TEMPERATURE OUTPUT CURRENT vs. RECEIVER OUTPUT HIGH VOLTAGE 50 -40 -15 10 35 60 85 -40 -15 10 35 60 OUTPUT HIGH VOLTAGE (V) TEMPERATURE (°C) RS-485/422 RS-485/422 DRIVER PROPAGATION DELAY vs. TEMPERATURE (SLOW) RS-485/422 RS-485/422 DRIVER PROPAGATION (FAST, 10Mbps) RS-485/422 RS-485/422 DRIVER PROPAGATION (SLOW, 250kbps) 480 MAX3160/2 MAX3160/2 TOC20 MAX3160/2 MAX3160/2 TOC19 500 R = 50 460 MAX3160/2 MAX3160/2 TOC21 DI 5V/div 440 TIME (ns) 85 TEMPERATURE (°C) DI 5V/div 420 400 VY-VZ 2V/div 380 VY-VZ 2V/div 360 340 320 300 -40 -15 10 35 60 20ns/div 1.0µs/div RS-485/422 RS-485/422 RECEIVER PROPAGATION (FAST, 5Mbps) RS-485/422 RS-485/422 DRIVER DISABLE/ENABLE TO DRIVER OUTPUT 85 TEMPERATURE (°C) I-V OUTPUT IMPEDANCE CURVE IN RS-232 RS-232 SHUTDOWN MODE MAX3160/2 MAX3160/2 TOC24 MAX3160/2 MAX3160/2 TOC22 MAX3160-A MAX3160-A 400 200 DE485 DE485 2V/div VY-VZ 2V/div CURRENT (µA) 0 R = 50 CL = 82pF -200 -400 CL = 50pF RO 2V/div -600 VY - VZ 2V/div -800 -1000 -20 -15 -10 -5 0 5 10 15 20 40ns/div 100ns/div VOLTS (V) _ 7 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Typical Operating Characteristics (continued) (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all RS-232 RS-232 transmitters (RS-232 RS-232 mode) loaded with 3k to ground, TA = +25°C, unless otherwise noted.) MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers Pin Description PIN NAME FUNCTION MAX3160 MAX3160 MAX3161 MAX3161 MAX3162 MAX3162 1 1 1 C1+ Positive Terminal of the Positive Flying Capacitor 2 2 2 VCC Positive Supply Voltage 3 3 3 C1- 4 4 4 GND - 5 5 T1OUT 5 - - Z(B)/T1OUT - - 6 Z - 6 - Z(B) 6 - - Y(A)/T2OUT - - 7 Y - 7 - Y(A) Negative Terminal of the Positive Flying Capacitor Ground RS-232 RS-232 Driver Output Inverting RS-485/422 RS-485/422 Driver Output in Full-Duplex Mode (and Inverting RS-485/422 RS-485/422 Receiver Input in Half-Duplex Mode)/RS-232 /RS-232 Driver Output Inverting RS-485/422 RS-485/422 Driver Output Inverting RS-485/422 RS-485/422 Driver Output in Full-Duplex Mode (and Inverting RS-485/422 RS-485/422 Receiver Input in Half-Duplex Mode) Noninverting RS-485/422 RS-485/422 Driver Output in Full-Duplex Mode (and Noninverting RS-485/422 RS-485/422 Receiver Input in Half-Duplex Mode)/RS-232 /RS-232 Driver Output Noninverting RS-485/422 RS-485/422 Driver Output Noninverting RS-485/422 RS-485/422 Driver Output in Full-Duplex Mode (and Noninverting RS-485/422 RS-485/422 Receiver Input in Half-Duplex Mode) 7 9 9 R1OUT RS-232 RS-232 Receiver Output - 8 8 T2OUT RS-232 RS-232 Driver Output 8 10 - RO/R2OUT RS-485/422 RS-485/422 Receiver Output/RS-232 Receiver Output Active-Low Shutdown-Control Input. Drive low to shut down transmitters and charge pump. 9 11 13 SHDN - - 10 R2OUT RS-232 RS-232 Driver Output Select slew rate limiting for both RS-232 RS-232 and RS485/422 RS485/422. Slew rate limits with a logic-level low. 10 14 FAST - - 11 RO 11 13 - RS485/RS232 RS485/RS232 - - 12 RE485 RE485 RS-485/422 RS-485/422 Receiver Enable. Logic-level low enables RS-485/422 RS-485/422 receivers. 12 8 12 14 - HDPLX Software-Programmable Pin Functionality. Operates in full-duplex mode when low; operates in half-duplex mode when high. RS-485/422 RS-485/422 Receiver Output Software-Programmable Pin Functionality. Operates as RS-485/422 RS-485/422 with a logic-level high; operates as RS-232 RS-232 with a logic-level low. _ +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers PIN NAME FUNCTION MAX3160 MAX3160 MAX3161 MAX3161 MAX3162 MAX3162 13 - - A/R2IN Noninverting RS-485/422 RS-485/422 Receiver Input/RS-232 Receiver Input 14 - - B/R1IN Inverting RS-485/422 RS-485/422 Receiver Input/RS-232 Receiver Input - - 15 RE232 RE232 RS-232 RS-232 Receiver Enable. Logic-level low enables RS232 RS232 receivers. - 15 17 A 15 19 - DE485/T2IN DE485/T2IN - - 16 TE232 TE232 - 16 18 B 16 20 - DI/T1IN - 17 19 R2IN 17 21 25 V- - 18 20 R1IN 18 22 26 C2- 19 23 27 C2+ 20 24 28 V+ - - 21 T2IN - - 22 DE485 DE485 - - 23 DI - - 24 T1IN Noninverting RS-485/422 RS-485/422 Receiver Input RS-485/RS-422 RS-485/RS-422 Driver Enable/RS-232 Driver Input RS-232 RS-232 Transmitter Output Enable Inverting RS-485/422 RS-485/422 Receiver Input RS-485/RS-422 RS-485/RS-422 Driver Input/RS-232 Driver Input RS-232 RS-232 Receiver Input Negative Charge-Pump Rail RS-232 RS-232 Receiver Input Negative Terminal of the Negative Flying Capacitor Positive Terminal of the Negative Flying Capacitor Positive Charge-Pump Rail RS-232 RS-232 Driver Input RS-485/RS-422 RS-485/RS-422 Driver Enable RS-485/RS-422 RS-485/RS-422 Driver Input RS-232 RS-232 Driver Input _ 9 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Pin Description (continued) +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Functional Diagrams MAX3160 MAX3160 RS-485 RS-485 MODE RS-232 RS-232 MODE VCC VCC 1 C1+ V+ 1 20 C3 C1 2 3 VCC C2+ CHARGE PUMP C1- 2 19 C2 C2- 3 18 CBYPASS CBYPASS 4 GND C1 V- 4 17 C1+ V+ VCC C2+ C1- RS-232 RS-232 OUTPUTS 5 6 LOGIC OUTPUTS 7 8 9 SHDN 10 FAST 10 T2 R1 R2 5 16 15 LOGIC INPUTS 13 HDPLX 12 RS-485/RS-232 RS-485/RS-232 11 RS-485 RS-485 OUTPUTS VZ 6 RS-232 RS-232 INPUTS C3 18 17 LOGIC INPUTS 15 DE B R A 9 SHDN 10 FAST C4 16 Y R0 LOGIC OUTPUT 8 C2 19 D 7 14 C2- GND C4 T1 CHARGE PUMP 20 14 RS-485 RS-485 INPUTS 13 12 RS-485/RS-232 RS-485/RS-232 11 _ HALF/FULL DUPLEX +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers MAX3161 MAX3161 RS-232 RS-232 MODE RS-485 RS-485 MODE VCC VCC 1 C1+ V+ 24 1 C3 C1 2 3 VCC C2+ CHARGE PUMP C1- 23 2 C2 C2- 3 22 CBYPASS CBYPASS 4 GND V- 4 21 C1+ V+ VCC C2+ 24 C3 C1 CHARGE PUMP C1- C2- GND V- 23 C2 22 21 C4 T1 5 RS-232 RS-232 OUTPUTS 6 19 7 LOGIC INPUTS 18 T2 8 LOGIC OUTPUTS 5 20 R1 9 R2 10 11 SHDN 12 FAST 17 16 15 HDPLX 14 RS-485/RS-232 RS-485/RS-232 13 6 RS-485 RS-485 OUTPUTS 20 LOGIC INPUTS Z 19 D 7 RS-232 RS-232 INPUTS C4 Y 18 DE 8 17 B 9 R0 LOGIC OUTPUT 10 11 SHDN 12 FAST R A 16 RS-485 RS-485 INPUTS 15 14 HALF/FULL DUPLEX RS-485/RS-232 RS-485/RS-232 13 _ 11 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Functional Diagrams (continued) +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Functional Diagrams (continued) Test Circuits MAX3162 MAX3162 Y R VCC 1 C1+ V+ VCC C2+ VOD 28 R C3 C1 2 3 CHARGE PUMP C1- C2- 27 Figure 1. RS-485/422 RS-485/422 Driver DC Test Load CBYPASS 4 GND V- 6 RS-485 RS-485 OUTPUTS 7 25 C4 T1 RS-232 RS-232 5 OUTPUT Z C2 26 24 Z 23 D Y DE485 DE485 LOGIC INPUTS 22 1k TEST POINT RECEIVER OUTPUT 1k 211 R1 S2 9 10 20 RS-232 RS-232 INPUTS R2 19 B 11 RO 12 VCC S1 CL T2 RS-232 RS-232 8 OUTPUT LOGIC OUTPUTS VOC RE485 RE485 13 SHDN 18 RS-485 RS-485 INPUTS R A TE232 TE232 Figure 2. RS-485/422 RS-485/422 Receiver Enable/Disable Timing Test Load 17 3V 16 DE485 DE485 14 FAST CL 15 DI Y VOD RDIFF Z CL Figure 3. RS-485/422 RS-485/422 Driver Timing Test Circuit 12 _ +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers 3V DI 1.5V 0 OUTPUT UNDER TEST S1 500 1.5V tDPHL tDPLH VCC 1/2 VO Z VO Y CL S2 VDIFF VO 0 -VO 1/2 VO 10% VDIFF = Vy - Vz 90% 90% TDR 10% TDF tDSKEW = | tDPLH - tDPHL | Figure 4. RS-485/422 RS-485/422 Driver Enable/Disable Timing Test Load 3V DE485 DE485 0 1.5V Figure 5. RS-485/422 RS-485/422 Driver Propagation Delays 1.5V tDZL RO tDLZ Y, Z 2.3V OUTPUT NORMALLY LOW VOL +0.5V VOH VOL tDZH B tRPLH INPUT tDHZ Figure 6. RS-485/422 RS-485/422 Driver Enable and Disable Times 1.5V Figure 7. RS-485/422 RS-485/422 Receiver Propagation Delays 1.5V tRZL B tRLZ 1.5V OUTPUT NORMALLY LOW VOL + 0.5V VID R A OUTPUT NORMALLY HIGH RO tRPHL VOH -0.5V 2.3V 0 VCC RO A VCC/2 OUTPUT OUTPUT NORMALLY HIGH Y, Z 3V RE485 RE485 0 1V -1V VOL VCC/2 RO CL VOH - 0.5V 1.5V 0 tRZH tRHZ Figure 8. MAX3162 MAX3162 RS-485/422 RS-485/422 Receiver Enable and Disable Times Figure 9. RS-485/422 RS-485/422 Receiver Propagation Delays Test Circuit _ 13 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Test Circuits (continued) MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers Detailed Description The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 3V/5V, multiprotocol transceivers can be pin configured in a number of RS232 RS232 and RS-485/422 RS-485/422 interface combinations. These circuit configurations are ideal for the design of RS-232 RS-232 to RS-485 RS-485 converters, multiprotocol buses, or any application that requires both RS-232 RS-232 and RS-485 RS-485 transceivers. The slew rate of these devices is on-the-fly pin programmable, allowing reduced EMI data rates, or up to 10Mbps RS-485 RS-485 communications. Power consumption can be reduced to 1µA by using the shutdown function, but the RS-232 RS-232 receivers remain active allowing other devices to query the interface controller. A flow-through pinout and the space-saving SSOP packages (available in the commercial and extended temperature ranges) facilitate board layout. Device Selection The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 contain RS-232 RS-232 transceivers and an RS-485/422 RS-485/422 transceiver. The primary difference between the devices is the multiplexing of the I/O pins. The MAX3160 MAX3160 has common transmitter outputs and receiver inputs for its RS-232 RS-232 and RS-485/422 RS-485/422 transceivers, and common digital I/O pins. The MAX3160 MAX3160 is optimized for multiprotocol operation on a single interface bus and comes in a 20-pin SSOP. The MAX3161 MAX3161 has separate transmitter outputs and receiver inputs for its RS-232 RS-232 and RS-485/422 RS-485/422 transceivers, and common digital I/O pins. The MAX3161 MAX3161 is optimized for multiplexing a single UART across two interface buses and comes in a 24-pin SSOP. The MAX3162 MAX3162 has separate transmitter outputs and receiver inputs for its RS-232 RS-232 and RS-485/422 RS-485/422 transceivers, and separate digital I/O pins. The MAX3162 MAX3162 is optimized for protocol translation between two interface buses and comes in a 28-pin SSOP. See Tables 1­12, Functional Diagrams, and the following descriptions for details on each device. MAX3160 MAX3160 The MAX3160 MAX3160 is a 2TX/2RX RS-232 RS-232 transceiver in RS232 RS232 mode, capable of RS-232-compliant communication. Assertion of RS-485/RS-232 RS-485/RS-232 converts the device to a single RS-485 RS-485 transceiver by multiplexing the RS-232 RS-232 I/O pins to an RS-485 RS-485 driver and receiver pair. The logic inputs now control the driver input and the driver enable. One logic output carries the RS-485 RS-485 receiver output, and the other is three-stated. The receiver input impedance is dependent on the device mode and is 1/4-unit load for RS-485 RS-485 operation and 5k for RS-232 RS-232 operation. 14 MAX3161 MAX3161 The MAX3161 MAX3161 is a 2TX/2RX RS-232 RS-232 transceiver in RS232 RS232 mode or a single RS-485/422 RS-485/422 transceiver in RS-485 RS-485 mode. When in RS-485 RS-485 mode, the unused RS-232 RS-232 transmitter and receiver output pins are disabled. When in RS-232 RS-232 mode, the RS-485 RS-485 transmitter outputs are disabled and the RS-232 RS-232 receiver inputs are 5k to GND. The RS-485 RS-485 receiver inputs are always 1/8-unit load. Logic lines are shared between the two protocols and are used for signal inputs and as an RS-485 RS-485 driver enable. MAX3162 MAX3162 The MAX3162 MAX3162 is a 2TX/2RX RS-232 RS-232 transceiver and a single RS-485/422 RS-485/422 transceiver simultaneously. All drivers, receivers, and transmitters can be enabled or disabled by pin configuration. All outputs are high-Z when not activated. RS-232 RS-232 receiver inputs are 5k when enabled, and RS-485 RS-485 receiver inputs are 1/8-unit load. FAST Mode operation The FAST control pin is used to select the slew-rate limiting of the RS-232 RS-232 transmitters and the RS-485/422 RS-485/422 drivers. With FAST unasserted, the RS-232 RS-232 transmitters and the RS-485/422 RS-485/422 driver are slew-rate limited to reduce EMI. RS-232 RS-232 data rates up to 1Mbps and RS485/422 RS485/422 data rates up to 10Mbps are possible when FAST is asserted. FAST can be changed during operation without interrupting data communications. Half-Duplex RS-485/422 RS-485/422 Operation Asserting HDPLX places the MAX3160/MAX3161 MAX3160/MAX3161 in half-duplex mode. The RS-485 RS-485 receiver inputs are internally connected to the driver outputs. The RS-485 RS-485 driver outputs can be disabled by pulling DE485 DE485 low. HDPLX has no affect on RS-232 RS-232 operation. Low-Power Shutdown The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 have an active-low shutdown control input, SHDN. When driven low, the charge pump and transmitters are shut down and supply current is reduced to 1µA. The RS-232 RS-232 receiver outputs remain active if in RS-232 RS-232 mode. The chargepump capacitors must be recharged when coming out of shutdown before resuming operation in either RS-232 RS-232 or RS-485/422 RS-485/422 mode (Figure 10). Dual Charge-Pump Voltage Converter The MAX3160/MAX3161/MAX3162s' internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) for input voltages (VCC) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode: if the magnitude of either output voltage is less than 5.5V, the _ +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers RS-485/422 RS-485/422 Transceivers The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 RS-485/422 RS-485/422 transceivers feature fail-safe circuitry that guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled (see Fail-Safe). The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 also feature pin-selectable reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps (see Reduced EMI and Reflections). The transmitters may operate at speeds up to 10Mbps with the slew-rate limiting disabled. Drivers are short-circuit current limited and thermally limited to protect them against excessive power dissipation. Half-duplex communication is enabled by driving HDPLX high. Fail-Safe The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 guarantee a logichigh RS-485 RS-485 receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. This is done by having the receiver threshold between -50mV and -200mV. If the differential receiver input voltage (A-B) is greater than or equal to -50mV, RO is logic high. If A-B is less than or equal to -200mV, RO is logic low. In the case of a terminated bus with all transmitters disabled, the receiver's differential input voltage is pulled to GND by the termination. This results in a logic high with a 50mV minimum noise margin. Unlike other fail-safe devices, the -50mV to -200mV threshold complies with the ±200mV EIA/TIA-485 EIA/TIA-485 standard. RS-232 RS-232 Transceivers The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 RS-232 RS-232 transmitters are inverting-level translators that convert CMOS-logic levels to ±5.0V EIA/TIA-232-compliant levels. The transmitters are guaranteed at a 250kbps data rate in slewrate limited mode (FAST = GND) with worst-case loads of 3k in parallel with 1000pF. Data rates up to 1Mbps can be achieved by asserting FAST. When powered down or in shutdown, the MAX3160/ MAX3160/ MAX3161/MAX3162 MAX3161/MAX3162 outputs are high impedance and can be driven to ±12V. The transmitter inputs do not have pullup resistors. Connect unused inputs to ground or VCC. The receivers convert RS-232 RS-232 signals to CMOS-logic output levels. All receivers have inverting outputs that remain active in shutdown. The MAX3160/MAX3161/ MAX3160/MAX3161/ MAX3162 MAX3162 permit their receiver inputs to be driven to Dia ±25V. Floating receiver input signals are pulled to ground through internal 5k resistors, forcing the outputs to a logic high. The MAX3162 MAX3162 has transmitter and receiver enable pins that allow its outputs to be threestated. Applications Information Capacitor Selection The capacitor type used for C1­C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. Ceramic chip capacitors with an X7R dielectric provide the best combination of performance, cost, and size. The charge pump requires 0.1µF capacitors for 3.3V operation. For other supply voltages, see Table 13 for required capacitor values. Do not use values smaller than those listed in Table 13. Increasing the capacitor values reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be changed without changing C1's value. However, do not increase C1 without also increasing the values of C2, C3, C4, and CBYPASS to maintain the proper ratios to the other capacitors. When using the minimum required capacitor values, make sure the capacitance value does not degrade excessively with temperature or voltage. This is typical of Y5V and Z5U dielectric ceramic capacitors. If in doubt, use capacitors with a larger nominal value. The capacitor's equivalent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V-. Power-Supply Decoupling In applications that are sensitive to power-supply noise, decouple VCC to ground with a capacitor of the same value as reservoir capacitors C2, C3, and C4. Connect the bypass capacitor as close to the IC as possible. RS-232 RS-232 Transmitter Outputs when Exiting Shutdown Figure 10 shows two transmitter outputs when exiting shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS-232 RS-232 levels (one transmitter input is high, the other is low). Each transmitter is loaded with 3k in parallel with 1000pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that the transmitters are enabled only when V- exceeds approximately -3V. _ 15 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 charge pumps are enabled; if the magnitude of both output voltages exceeds 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (see Functional Diagrams). MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers Truth Tables RS-232 RS-232 Receivers RS-232 RS-232 Transmitters Table 4. MAX3160 MAX3160 Table 1. MAX3160 MAX3160 INPUTS OUTPUTS OUTPUTS INPUTS SHDN RS-485/ RS-485/ RS-232 RS-232 B/R1IN, A/R2IN R1OUT, RO/R2OUT X 0 0 1 X 0 1 0 X 0 Inputs Open 1 SHDN RS485 RS485 RS232 RS232 DI/T1IN, DE485/T2IN DE485/T2IN Z(B)/T1OUT, Y(A)/T2OUT 0 X X 1/8 Unit Load 1 0 0 1 1 0 1 0 1 1 X RS-485 RS-485 Mode X 1 X R1OUT High-Z, RO/R2OUT in RS-485 RS-485 mode Table 5. MAX3161 MAX3161 Table 2. MAX3161 MAX3161 INPUTS INPUTS OUTPUTS SHDN RS-485/ RS-485/ RS-232 RS-232 DI/T1IN, DE485/T2IN DE485/T2IN T1OUT, T2OUT 0 X X High-Z 1 0 0 1 1 0 1 1 X High-Z RS-485/ RS-485/ RS-232 RS-232 R1IN, R2IN R1OUT, RO/R2OUT X 0 0 1 X 0 1 0 X 0 Inputs Open X 1 X 1 R1OUT High-Z, RO/R2OUT in RS-485 RS-485 mode Table 6. MAX3162 MAX3162 Table 3. MAX3162 MAX3162 INPUTS SHDN TE232 TE232 T1IN,T2IN 0 X 1 1 X 0 1 1 X X 0 1 OUTPUTS T1OUT, T2OUT High-Z High-Z 1 0 High Data Rates The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 maintain the RS-232 RS-232 ±5.0V required minimum transmitter output voltage even at high data rates. Figure 11 shows a transmitter loopback test circuit. Figure 12 shows a loopback test result at 250kbps, and Figure 13 shows the same test at 1000kbps. Figure 12 demonstrates a single slew-rate limited transmitter driven at 250kbps (FAST = GND) into an RS-232 RS-232 load in parallel with 1000pF. Figure 13 shows 16 SHDN 0 1 OUTPUTS INPUTS OUTPUTS SHDN RE232 RE232 R1IN, R2IN R1OUT, R2OUT X 1 X High-Z X 0 0 1 X 0 1 0 X 0 Inputs open 1 a single transmitter driven at 1Mbps (FAST asserted), loaded with an RS-232 RS-232 receiver in parallel with 1000pF. These transceivers maintain the RS-232 RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps. 256 Transceivers on the Bus The standard RS-485 RS-485 receiver input impedance is 12k (one-unit load), and the standard driver can drive up to 32-unit loads. The MAX3160 MAX3160 has a 1/4-unit load receiver input impedance (48k), allowing up to 128 trans- _ +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers RS-485/422 RS-485/422 Drivers Table 7. MAX3160 MAX3160 INPUTS OUTPUTS SHDN R RS485/R RS485/R S 2 3 2 DE485/T2IN DE485/T2IN 0 1 1 1 1 1 DI/T1IN Z(B)/T1OUT Y(A)/T2OUT X X 1/8 Unit Load 1/8 Unit Load 0 X 1/8 Unit Load 1/8 Unit Load 1 0 1 0 0 1 1 1 1 X 0 X X 1 RS-232 RS-232 Mode Table 8. MAX3161 MAX3161 INPUTS OUTPUTS SHDN R RS485/R RS485/R S 2 3 2 DE485/T2IN DE485/T2IN DI/T1IN Z(B) Y(A) 0 X X X 1/8 Unit Load 1/8 Unit Load X 0 X X 1/8 Unit Load 1/8 Unit Load X X 0 X 1/8 Unit Load 1/8 Unit Load 1 1 1 0 1 0 1 1 1 1 0 1 Table 9. MAX3162 MAX3162 INPUTS OUTPUTS SHDN DE485 DE485 DI Z Y 0 X X High-Z High-Z X 0 X High-Z High-Z 1 1 0 1 0 1 1 1 0 1 RS-485/422 RS-485/422 Receivers Table 10. MAX3160 MAX3160 INPUTS OUTPUT RS485/RS232 RS485/RS232 SHDN HDPLX A - B* Y - Z* RO/R2OUT 1 0 X X X High-Z Up to VCC 1 1 0 -50mV X 1 1 1 0 -200mV X 0 1 1 0 Floating X 1 1 1 1 X -50mV 1 1 1 1 X -200mV 0 1 1 1 X Floating 1 0 X X X X RS-232 RS-232 Mode *Y and Z correspond to pins Y(A)/T2OUT and Z(B)/T1OUT. A and B correspond to pins A/R2IN and B/R1IN. _ 17 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Truth Tables (continued) MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers Truth Tables (continued) Table 11. MAX3161 MAX3161 INPUTS OUTPUT RS485/RS232 RS485/RS232 SHDN HDPLX A-B Y(A) - Z(B) RO/R2OUT 1 0 X X X High-Z up to VCC 1 1 0 -50mV X 1 1 1 0 -200mV X 0 1 1 0 Floating X 1 1 1 1 X -50mV 1 1 1 1 X -200mV 0 1 1 1 X Floating 1 0 X X X X RS-232 RS-232 Mode Table 12. MAX3162 MAX3162 INPUTS OUTPUT SHDN RE485 RE485 A-B RO Table 13. Required Minimum Capacitance Values 0 X X High-Z SUPPLY VOLTAGE (V) X 1 X High-Z +3.0 TO +3.6 0.1 0.1 1 0 -50mV 1 +4.5 TO +5.5 0.047 0.33 1 0 -200mV 0 +3.0 TO +5.5 0.1 0.47 1 0 Inputs Open 1 ceivers to be connected in parallel on one communication line. The MAX3161/MAX3162 MAX3161/MAX3162 have a 1/8-unit load receiver input impedance (96k), allowing up to 256 transceivers to be connected in parallel on one communication line. Any combination of these devices and/or other RS-485 RS-485 transceivers with a total of 32-unit loads or fewer can be connected to the line. The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 RS-485 RS-485 driver outputs are 1/8-unit load when disabled This impedance may be reduced if the D1 pin is toggled at a high frequency. With no power applied (VCC = GND), the RS485 RS485 transmitter output impedances typically go to 1/2unit load on the MAX3161/MAX3162 MAX3161/MAX3162, and to one-unit load on the MAX3160 MAX3160. Driver Output Protection Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. The first, a foldback current limit on the output stage, provides immediate protection against short circuits over the whole common-mode voltage range (see 18 C1 (µF) C2, C3, C4, CBYPASS (µF) Typical Operating Characteristics). The second, a thermal shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature becomes excessive. Protection Against Wiring Faults EIA/TIA-485 EIA/TIA-485 standards require a common input voltage range of -7V to +12V to prevent damage to the device. The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 inputs are protected to RS-232 RS-232 levels of ±25V for the receiver inputs and ±13.2V for the transmitter/driver outputs. This provides additional protection for the RS-485 RS-485 transceivers against ground differential or faults due to miswiring. RS-485/422 RS-485/422 Reduced EMI and Reflections The MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 can be configured for slew-rate limiting by pulling FAST low. This minimizes EMI and reduces reflections caused by improperly terminated cables. Operation in slew-rate limited mode reduces the amplitudes of high-frequency harmonics. _ +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 MAX 3160-2 FIG10 FIG10 MAX 3160-2 FIG12 FIG12 SHDN 5V/division TIN T1OUT 2V/div TOUT GND 5V/div T2OUT 2V/div ROUT 40µs/div 1µs/div Figure 10. MAX3160 MAX3160 RS-232 RS-232 Transmitter Outputs When Exiting Shutdown Figure 12. RS-232 RS-232 Loopback Test Result at 250kbps, FAST = Low MAX 3160-2 FIG13 FIG13 VCC CBYPASS TIN VCC C1+ TOUT V+ C1 C3 C1C2+ C2 C2- 5V/div MAX3160 MAX3160 MAX3161 MAX3161 MAX3162 MAX3162 VC4 ROUT T_ OUT T_ IN 200ns/div Figure 13. RS-232 RS-232 Loopback Test Result at 1000kbps, FAST = High R_ IN R_ OUT 1000pF 5k VCC SHDN GND Figure 11. Loopback Test Circuit RS-485/422 RS-485/422 Line Length vs. Data Length The RS-485/422 RS-485/422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, use the repeater application shown in Figure 14. RS-232/RS-485 RS-232/RS-485 Protocol Translator Figure 15 shows the MAX3162 MAX3162 configured as an RS232/RS-485 RS232/RS-485 protocol translator. The direction of translation is controlled through the RTS signal (R1IN). The single-ended RS-232 RS-232 receiver input signal is translated to a differential RS-485 RS-485 transmitter output. Similarly, a differential RS-485 RS-485 receiver input signal is translated to a single-ended RS-232 RS-232 transmitter output. RS-232 RS-232 data received on R2IN is transmitted as an RS-485 RS-485 signal on Z and Y. RS-485 RS-485 signals received on A and B are transmitted as an RS-232 RS-232 signal on T1OUT. Multiprotocol Bus The Typical Operating Circuit shows a standard application for the MAX3160 MAX3160. The MAX3160 MAX3160's output pins are multiplexed between RS-232 RS-232 and RS-485 RS-485 protocols by a microprocessor (µP). The µP also directs the shutdown functions, enable lines, and the duplex of the MAX3160 MAX3160. Data is transmitted to the MAX3100 MAX3100 UART through an SPITM port. The UART asynchronously _ 19 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers 3.3V MAX3160 MAX3160 MAX3161 MAX3161 MAX3162 MAX3162 A CBYPASS 100nF 120 RO R RE485 RE485 DATA IN B 2 27 C2 100nF DE485 DE485 Z DI D Y 26 120 13 DATA OUT 5 RCV 10 23 NOTE: RE485 RE485 ON MAX3162 MAX3162 ONLY 19 TX 20 RTS 15 Figure 14. RS-485 RS-485 Line Repeater 16 14 transfers data through the MAX3160 MAX3160 to the pin-selected RS-232 RS-232 or RS-485 RS-485 protocal; see Table 14 for commonly used cable connections. 28 C2+ VCC C1+ C2- MAX3162 MAX3162 C1- 1 3 SHDN T1OUT T1IN 24 R2IN 11 RO 9 R1OUT 12 RE485 RE485 22 DE485 DE485 R1IN A RE232 RE232 B TE232 TE232 Z FAST Y R2OUT DI V+ C3 100nF GND V- 17 18 6 7 25 4 Multiprotocol Bus Multiplexer The Typical Application Circuit shows the MAX3161 MAX3161 configured as a multiprotocol bus multiplexer. The MAX3161 MAX3161 separates the RS-232 RS-232 and RS-485 RS-485 lines, but shares the logic pins between modes. This application allows the µP to monitor a point-to-point RS-232 RS-232 bus, and a multidrop RS-485 RS-485 interface. The MAX3100 MAX3100 UART asynchronously transfers data through the MAX3161 MAX3161 to the pin-selected RS-232 RS-232 or RS-485 RS-485 protocol. Figure 15. Protocol Translator SPI is a trademark of Motorola, Inc. 20 C1 100nF _ C4 100nF +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers EIA/TIA-232 EIA/TIA-232 STANDARD CONNECTOR PIN MAX3160 MAX3160 MAX3161 MAX3161 MAX3162 MAX3162 EQUIVALENT MAX3160 MAX3160 MAX3161 MAX3161 MAX3162 MAX3162 PIN NUMBER FUNCTION (as seen by DTE) DCD 1 RD 2 R2IN 13 17 19 Data Carrier Detect TD 3 T1OUT 5 5 5 DTR 4 SG 5 DSR 6 RTS 7 T2OUT 6 8 8 CTS 8 R1IN 14 18 20 RI 9 Received Data Transmitted Data Data Terminal Ready GND 4 4 4 Signal Ground Data Set Ready Request to Send (= DTE ready) Clear to Send (= DCE ready) Ring Indicator Typical Application Circuit + 2 VCC TX 13 T1OUT 5 20 RO/R2OUT 10 DE/T2IN CTS R1OUT RX 12 11 10 DB9 DI/T1IN RTS MAX3100 MAX3100 UART 14 HDPLX R2IN 17 T2OUT 8 R1IN MAX3161 MAX3161 19 9 18 1 SPI GND 4 µP RS-232 RS-232 FAST 12 SHDN Y(A) 7 Z(B) 6 RS-485 RS-485 RJ45 RS-485/RS-232 RS-485/RS-232 SHDN _ 21 MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Table 14. Cable Connections Commonly Used for EIA/TIA-232 EIA/TIA-232 and V.24 Asynchronous Interfaces +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Pin Configurations TOP VIEW C1+ 1 20 V+ C1+ 1 24 V+ C1+ 1 28 V+ VCC 2 19 C2+ VCC 2 23 C2+ VCC 2 27 C2+ C1- 3 18 C2- C1- 3 22 C2- C1- 3 26 C2- GND 4 17 V- GND 4 21 V- GND 4 25 V- Z(B)/T1OUT 5 MAX3160 MAX3160 Y(A)/T2OUT 6 16 DI/T1IN T1OUT 5 MAX3161 MAX3161 20 DI/T1IN T1OUT 5 24 T1IN MAX3162 MAX3162 15 DE485/T2IN DE485/T2IN Z(B) 6 19 DE485/T2IN DE485/T2IN Z 6 R1OUT 7 14 B/R1IN Y(A) 7 18 R1IN Y 7 RO/R2OUT 8 13 A/R2IN T2OUT 8 17 R2IN T2OUT 8 21 T2IN SHDN 9 12 HDPLX R1OUT 9 16 B R1OUT 9 20 R1IN FAST 10 11 RS-485/RS-232 RS-485/RS-232 RO/R2OUT 10 15 A R2OUT 10 19 R2IN SHDN 11 14 HDPLX FAST 12 13 RS-485/RS-232 RS-485/RS-232 23 DI 22 DE485 DE485 24-PIN 24-PIN SSOP 18 B RE485 RE485 12 17 A SHDN 13 16 TE232 TE232 FAST 14 20-PIN 20-PIN SSOP RO 11 15 RE232 RE232 28-PIN 28-PIN SSOP Selector Guide PART FLOWTHROUGH PIN-OUT RS-485 RS-485 INPUT UNIT LOADS MAX3160 MAX3160 No Yes No No 1/8 MAX3162 MAX3162 Yes Yes TRANSISTOR COUNT: 1580 1/4 MAX3161 MAX3161 22 DUAL-MODE Chip Information 1/8 _ +3.0V to+5.5V, 1µA, RS-232/RS-485/422 RS-232/RS-485/422 Multiprotocol Transceivers SSOP.EPS 2 1 INCHES MILLIMETERS DIM MIN MAX 0.068 0.078 1.73 1.99 A1 0.002 0.008 0.05 0.21 B 0.010 0.015 0.25 0.38 C H MAX A E MIN 0.20 0.09 0.004 0.008 SEE VARIATIONS D E e 0.205 0.212 0.0256 BSC 5.20 MILLIMETERS INCHES MIN D D D D D 5.38 MAX MIN MAX 0.239 0.239 0.278 0.249 0.249 0.289 6.07 6.07 7.07 6.33 6.33 7.33 0.317 0.397 0.328 0.407 8.07 10.07 8.33 10.33 N 14L 16L 20L 24L 28L 0.65 BSC H 0.301 0.311 7.65 7.90 L 0.025 0 0.037 8 0.63 0 0.95 8 N A C B e A1 L D NOTES: 1. D&E DO NOT INCLUDE MOLD FLASH. 2. MOLD FLASH OR PROTRUSIONS NOT TO EXCEED .15 MM (.006"). 3. CONTROLLING DIMENSION: MILLIMETERS. 4. MEETS JEDEC MO150 MO150. 5. LEADS TO BE COPLANAR WITHIN 0.10 MM. PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, SSOP, 5.3 MM APPROVAL DOCUMENT CONTROL NO. 21-0056 REV. C 1 1 Revision History Pages changed at Rev1: 1, 20, 23 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 23 _Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX3160/MAX3161/MAX3162 MAX3160/MAX3161/MAX3162 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)