DESCRIPTIO Software-Selectable Transceiver Supports: RS232, RS449

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DESCRIPTIO Software-Selectable Transceiver Supports: RS232, RS449

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LTC2847 Software-Selectable Multiprotocol Transceiver with Termination 3.3V Digital Interface
DESCRIPTIO
Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 Operates from Single Supply Separate Supply Digital Interface Works down On-Chip Cable Termination Complete Port with LTC2845 Available 38-Pin Package
APPLICATIO
Data Networking Data Routers
LTC2847 3-driver/3-receiver multiprotocol transceiver with on-chip cable termination. When combined with LTC2845, this chip forms complete softwareselectable interface port that supports RS232, RS449, EIA530, EIA530-A, V.35, V.36 X.21 protocols. necessary cable termination provided inside LTC2847. supplies drivers, receivers internal charge pump that requires only five space-saving surface mounted capacitors. supply drives digital interface circuitry including receiver output drivers. tied powered lower supply (down interface with voltage ASICs. LTC2847 available 0.8mm tall, package.
registered trademarks Linear Technology Corporation.
TYPICAL APPLICATIO
Complete Multiprotocol Serial Interface with DB-25 Connector
SCTE
LTC2845
DB-25 CONNECTOR
2847 TA01
*OPTIONAL
sn2847 2847fs
LTC2847
(125)
(106)
(107)
(140)
(142)
(141)
(108)
(105)
SHIELD (101)
(102)
(109)
(114)
SCTE
SCTE (113)
(103)
(104)
(115)
LTC2847
ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW
Voltage. 0.3V 6.5V Voltage 0.3V 6.5V Input Voltage Transmitters 0.3V (VCC 0.3V) Receivers Logic Pins 0.3V (VCC 0.3V) Output Voltage Transmitters (VEE 0.3V) (VDD 0.3V) Receivers 0.3V (VIN 0.3V) 0.3V 0.3V Short-Circuit Duration Transmitter Output Indefinite Receiver Output Indefinite Operating Temperature Range LTC2847C 70°C LTC2847I 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER
D3/R1 D3/R1
DCE/DTE
LTC2847CUHF LTC2847IUHF PART MARKING 2847 2847I
PACKAGE 38-LEAD (7mm 5mm) PLASTIC UNDERSIDE METAL INTERNALLY CONNECTED (PCB CONNECTION OPTIONAL) TJMAX 125°C, 34°C/W
Consult Marketing parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL Supplies Supply Current (DCE Mode, Digital Pins VIN) PARAMETER
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 3.3V, unless otherwise noted (Notes
CONDITIONS RS530, RS530-A, X.21 Modes, Load RS530, RS530-A, X.21 Modes, Full Load V.35 Mode V.28 Mode, Load V.28 Mode, Full Load No-Cable Mode Modes Except No-Cable Mode RS530, RS530-A, X.21 Modes, Full Load V.35 Mode, Full Load V.28 Mode, Full Load V.11 V.28 Mode, Load V.35 Mode V.28 Mode, with Load V.28 Mode, with Load, 10mA
UNITS
IVIN
Supply Current (DCE Mode, Digital Pins VIN) Internal Power Dissipation (DCE Mode)
Positive Charge Pump Output Voltage
sn2847 2847fs
LTC2847
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Negative Charge Pump Output Voltage
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 3.3V, unless otherwise noted (Notes
CONDITIONS V.28 Mode, Load V.28 Mode, Full Load V.35 Mode RS530, RS530-A, X.21 Modes, Full Load No-Cable Mode/Power-Off Normal Operation DCE/DTE DCE/DTE DCE/DTE DCE/DTE 1.6mA VIN, VIN, 1.95k (Figure (Figure (Figure (Figure (Figure (Figure VOUT
0.25V, Power
UNITS
fOSC
Charge Pump Oscillator Frequency Charge Pump Rise Time Logic Input High Voltage Logic Input Voltage Logic Input Current
Logic Inputs Outputs -160 0.5VODO 0.67VODO ±150 ±100
IOSR IOZR V.11 Driver VODO VODL SKEW
Output High Voltage Output Voltage Output Short-Circuit Current Three-State Output Current
Open Circuit Differential Output Voltage Loaded Differential Output Voltage Change Magnitude Differential Output Voltage Common Mode Output Voltage Change Magnitude Common Mode Output Voltage Short-Circuit Current Output Leakage Current Rise Fall Time Input Output Rising Input Output Falling Input Output Difference, tPLH tPHL Output Output Skew
No-Cable Mode Driver Disabled (Figures (Figures (Figures (Figures (Figures
sn2847 2847fs
LTC2847
ELECTRICAL CHARACTERISTICS
SYMBOL V.35 Driver VOA, SKEW tPLH tPHL V.28 Driver Output Voltage Short-Circuit Current Power-Off Resistance Slew Rate Input Output Input Output Differential Output Voltage Single-Ended Output Voltage Transmitter Output Offset Transmitter Output High Current Transmitter Output Current Transmitter Output Leakage Current Transmitter Differential Mode Impedance Transmitter Common Mode Impedance Rise Fall Time Input Output Input Output Input Output Difference, tPLH tPHL Output Output Skew Differential Receiver Input Threshold Voltage Receiver Input Hysteresis Receiver Differential Mode Impedance Receiver Common Mode Impedance Rise Fall Time Input Output Input Output Input Output Difference, tPLH tPHL PARAMETER Input Threshold Voltage Input Hysteresis Input Impedance Rise Fall Time Input Output Rising Input Output Falling Input Output Difference, tPLH tPHL V.11 Receiver
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 3.3V, unless otherwise noted (Notes
CONDITIONS (Figure 50pF (Figures 50pF (Figures 50pF (Figures 50pF (Figures Open Circuit, 1.95k (Figure With Load, (Figure Open Circuit, 1.95k (Figure (Figure
0.25V
UNITS
±1.2 ±0.66 ±1.2 ±0.6
±0.44
±0.55
±100
(Figure (Figures (Figures (Figures (Figures (Figures (Figure (Figure (Figure 50pF (Figures 50pF (Figures 50pF (Figures 50pF (Figures Open Circuit (Figure VOUT Power No-Cable Mode (Figures 2500pF (Figures 2500pF (Figures
V.35 Receiver ±150 V/µs
sn2847 2847fs
±8.5
LTC2847
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER V.28 Receiver VTHL Input Threshold Voltage VTLH Input High Threshold Voltage Receiver Input Hysteresis Receiver Input Impedance Rise Fall Time tPLH Input Output tPHL Input Output
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 3.3V, unless otherwise noted (Notes
CONDITIONS (Figure (Figure (Figure 50pF (Figures 50pF (Figures 50pF (Figures
UNITS
0.05
Note Absolute Maximum Ratings those values beyond which life device impaired. Note currents into device pins positive; currents device negative. voltages referenced device ground unless otherwise specified.
Note typicals given 3.3V, CVCC CVIN 10µF, CVDD 1µF, CVEE 3.3µF 25°C.
TYPICAL PERFOR CHARACTERISTICS
V.11 Mode Data Rate
25°C
(mA)
(mA)
(mA)
1000 10000
2846
DATA RATE (kBd)
V.11 Mode Temperature
(mA)
(mA) 128.0 127.5 127.0 126.5
125.5 125.0 124.5 124.0 123.5
(mA)
TEMPERATURE (°C)
2846
V.35 Mode Data Rate
V.28 Mode Data Rate
25°C
25°C
1000 DATA RATE (kBd) 10000
2846
DATA RATE (kBd)
2846
V.35 Mode Temperature
37.5 37.0 36.5 36.0 35.5 35.0 34.5 34.0
TEMPERATURE (°C)
V.28 Mode Temperature
126.0
123.0
33.5
TEMPERATURE (°C)
3846
2846
sn2847 2847fs
LTC2847
CTIO
(Pins 1,3,18,19,22,23): Connect. (Pin Generated Positive Supply Voltage V.28. Connect capacitor ground. (Pin Input Supply Pin. Input supply charge pump transceiver. 4.75V 5.25V. Connect capacitor GND. (Pin Level Driver Input. (Pin Level Driver Input. (Pin Level Driver Input. (Pin CMOS Level Receiver Output with Pull-Up when Three-Stated. (Pin CMOS Level Receiver Output with Pull-Up when Three-Stated. (Pin 10): CMOS Level Receiver Output with Pull-Up when Three-Stated. (Pin 11): Level Mode Select Input with Pull-Up VIN. Table (Pin 12): Level Mode Select Input with Pull-Up VIN. Table (Pin 13): Input Supply Pin. Input supply digital interface including receiver output drivers. 5.25V. Connect (Pin separate supply lower receiver output swing. Connect capacitor GND. (Pin 14): Level Mode Select Input with Pull-Up VIN. Table DCE/DTE (Pin 15): Level Mode Select Input with Pull-Up VIN. Table (Pin 16): Receiver Noninverting Input. (Pin 17): Receiver Inverting Input. (Pin 20): Receiver Noninverting Input. (Pin 21): Receiver Inverting Input. D3/R1 (Pin 24): Receiver Noninverting Input Driver Noninverting Output. D3/R1 (Pin 25): Receiver Inverting Input Driver Inverting Output. (Pin 26): Driver Noninverting Output. (Pin 27): Driver Inverting Output. (Pin 28): Driver Noninverting Output. (Pin 29): Driver Inverting Output. (Pins 30,31): Transceiver Ground. (Pins 32,33,36): Generated Negative Supply Voltage. Connect 3.3µF capacitor GND. Exposed also connected VEE. (Pin 34): Capacitor Negative Terminal. Connect capacitor between (Pin 35): Capacitor Positive Terminal. Connect capacitor between (Pin 37): Capacitor Negative Terminal. Connect capacitor between C1-. (Pin 38): Capacitor Positive Terminal. Connect capacitor between C1-.
sn2847 2847fs
LTC2847
BLOCK DIAGRA
DCE/DTE
CHARGE PUMP 51.5 51.5 D3/R1 MODE SELECTION LOGIC 51.5 51.5 51.5 51.5 D3/R1
2847
sn2847 2847fs
LTC2847
TEST CIRCUITS
2847
100pF 100pF
2847
Figure V.11 Driver Test Circuit
Figure V.11 Driver Test Circuit
2847
2(VB 2847
Figure Input Impedance Test Circuit
Figure V.11, V.35 Receiver Test Circuit
2847
2847
2847
Figure V.35 Driver Open-Circuit Test
Figure V.35 Driver Test Circuit
Figure V.35 Driver Common Mode Impedance Test Circuit
51.5
2847
51.5
2847
2847
Figure V.35 Driver Test Circuit
Figure V.35 Receiver Test Circuit
Figure Receiver Common Mode Impedance Test Circuit
2847
2847
Figure V.28 Driver Test Circuit
Figure V.28 Receiver Test Circuit
sn2847 2847fs
LTC2847
SELECTIO
Table
Mode Name
(Note (Note
DCE/ D1,2
Used (Default V.11) RS530A RS530 X.21 V.35 RS449/V.36 V.28/RS232 Cable
Used (Default V.11) RS530A RS530 X.21 V.35 RS449/V.36 V.28/RS232 Cable
V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.35 V.35 V.35 V.35 V.35 V.35 V.35 V.35 V.35 V.35 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.28 V.28 V.28 V.28 V.28
Note Driver inputs level compatible. Note Unused receiver inputs terminated with ground. addition, always terminated differential impedence (see Block Diagram page Note Receiver Outputs CMOS level compatible have weak pull when
SWITCHI WAVEFOR
SKEW SKEW
2847
1.5V
Figure V.11, V.35 Driver Propagation Delays
VOD2 -VOD2 1.65V OUTPUT 1MHz 10ns 10ns INPUT 1.65V
2847
Figure V.11, V.35 Receiver Propagation Delays
sn2847 2847fs
(Note
(Note
(Note
(Note
R2,R3
(Note
(Note
(Note
CMOS CMOS CMOS CMOS CMOS CMOS CMOS CMOS CMOS CMOS CMOS CMOS CMOS CMOS 9.3V 9.3V 9.3V 9.3V 9.3V 8.7V 4.7V 9.3V 9.3V 9.3V 9.3V 9.3V 8.7V 4.7V -6.5V -8.5V 0.3V -6.5V -8.5V 0.3V
V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.11 V.35 V.35 V.35 V.35 V.11 V.11 V.11 V.11 V.28 V.28
V.11 V.11 V.11 V.11 V.11 V.11 CMOS V.11 V.11 V.11 V.11 V.11 V.11 CMOS V.11 V.11 V.11 V.11 V.11 V.11 CMOS V.11 V.11 V.11 V.11 V.11 V.11 CMOS V.35 V.35 V.35 V.35 V.35 V.35 CMOS V.11 V.11 V.11 V.11 V.11 V.11 CMOS V.28 V.28 V.28 CMOS
Note values shown typical values 3.3V 25°C with LTC2847 under full load each mode. Note values shown typical values 3.3V 25°C with LTC2847 under full load each mode.
1MHz 10ns 10ns
1.5V
LTC2847
SWITCHI WAVEFOR
1.5V 1.5V
2847
Figure V.28 Driver Propagation Delays
1.5V 1.65V 1.5V 1.65V
2847
Figure V.28 Receiver Propagation Delays
APPLICATIO ATIO
Overview
LTC2847 consists charge pump 3-driver/ 3-receiver transceiver. input powers charge pump transceiver. charge pump generates supplies. LTC2847's supplies used power companion chip like LTC2845. input powers digital interface including receiver output drivers. Having separate power digital interface allows flexibility controlling receiver output swing interface with 3.3V logic. LTC2847 LTC2845 form complete softwareselectable interface port that supports RS232, RS449, EIA530, EIA530-A, V.35, V.36 X.21 protocols. Cable termination provided on-chip, eliminating need discrete termination designs. complete DCE-to-DTE interface operating EIA530 mode shown Figure LTC2847 half each port used generate appropriately terminate clock data signals. LTC2845 used generate control signals along with (local loopback),
(Remote Loop-Back), (Test Mode) (Ring Indicate). Mode Selection interface protocol selected using mode select pins (see Table example, port configured V.35 interface, mode selection pins should control signals, drivers receivers will operate V.28 (RS232) electrical mode. clock data signals, drivers receivers will operate V.35 electrical mode. DCE/DTE will configure port mode when high, when low. interface protocol selected simply plugging appropriate interface cable into connector. mode pins routed connector left unconnected wired ground cable shown Figure internal pull-up current sources will ensure binary when left unconnected. mode selection also accomplished using jumpers connect mode pins ground VIN.
sn2847 2847fs
LTC2847
APPLICATIO ATIO
SERIAL CONTROLLER LTC2847
SCTE
LTC2845
Figure Complete Multiprotocol Interface EIA530 Mode
When cable removed, leaving mode pins unconnected, LTC2847/LTC2845 will enter no-cable mode. this mode LTC2847/LTC2845 supply current drops less than 1000µA LTC2847/LTC2845 driver outputs forced into high impedance state. same time, receivers LTC2847 differentially terminated with other receiv-
LTC2847 SERIAL CONTROLLER SCTE SCTE LTC2845
2847
LTC2847 LTC2845 terminated with ground. Cable Termination Traditional implementations used expensive relays switch resistors required user change termination modules every time interface standard
sn2847 2847fs
LTC2847
APPLICATIO ATIO
(DATA) LTC2847 DCE/DTE
DCE/DTE LTC2845 (DATA)
2847
Figure Single Port V.35 Mode Selection Cable
selected. Switching terminations with FETs difficult because FETs must remain when signal voltage beyond supply voltage. Alternatively, custom cables contain termination cable head route signals various terminations board. LTC2847/LTC2845 chip solves cable termination switching problem automatically providing appropriate termination switching on-chip V.10 (RS423), V.11 (RS422), V.28 (RS232) V.35 electrical protocols. V.10 (RS423) Interface V.10 drivers receivers necessary RS449, EIA530, EIA530-A, V.36 X.21 protocols implemented LTC2845. typical V.10 unbalanced interface shown Figure V.10 single-ended generator with output ground connected differential receiver with input connected ground connected signal return ground Usually, cable termination required V.10 interfaces, receiver inputs must compliant with impedance curve shown Figure V.10 receiver configuration LTC2845 shown Figure V.10 mode, switch inside LTC2845 turned off. noninverting input disconnected inside LTC2845 receivers connected ground.
CONNECTOR CABLE
GENERATOR BALANCED INTERCONNECTING CABLE LOAD CABLE TERMINATION RECEIVER
2847
Figure Typical V.10 Interface
3.25mA
-10V
-3.25mA
2847
Figure V.10 Receiver Input Impedance
sn2847 2847fs
LTC2847
APPLICATIO ATIO
RECEIVER LTC2845
2847
Figure V.10 Receiver Configuration
BALANCED INTERCONNECTING CABLE
GENERATOR
LOAD CABLE TERMINATION RECEIVER
Figure Typical V.11 Interface
cable termination then input impedance ground LTC2845 V.10 receiver. V.11 (RS422) Interface typical V.11 balanced interface shown Figure V.11 differential generator with outputs ground connected differential receiver with input connected input connected ground connected signal return ground V.11 interface differential termination receiver that minimum value 100. termination resistor optional V.11 specification, high speed clock data lines, termination essential prevent reflections from corrupting data. receiver inputs must also compliant with impedance curve shown Figure V.11 mode, switches except LTC2847's receivers which connects differential
there switch receivers However, simplicity, termination networks LTC2847 treated identically assumed that switch exists always closed receivers.
1Actually,
51.5 51.5 RECEIVER LTC2847
2847
Figure V.11 Receiver Configuration
termination impedance cable shown Figure 231. LTC2845 only handles control signals, termination other than V.11 receivers' input impedance necessary. V.28 (RS232) Interface typical V.28 unbalanced interface shown Figure V.28 single-ended generator with output ground connected single-ended receiver with input connected ground connected signal return ground
GENERATOR BALANCED INTERCONNECTING CABLE LOAD CABLE TERMINATION RECEIVER
2847
2847
Figure Typical V.28 Interface
51.5 51.5 RECEIVER LTC2847
2847
Figure V.28 Receiver Configuration
sn2847 2847fs
LTC2847
APPLICATIO ATIO
V.28 mode, closed inside LTC2847/LTC2845 which connects (R8) impedance ground parallel with (R5) plus (R6) combined impedance shown Figure Proper termination only provided when input receivers floating, since LTC2847's receivers remains V.28 mode1. noninverting input disconnected inside LTC2847/LTC2845 receiver connected level reference voltage give 1.4V receiver trip point. V.35 Interface typical V.35 balanced interface shown Figure V.35 differential generator with outputs ground connected differential receiver with input connected input connected ground connected signal return ground V.35 interface requires delta network termination receiver generator end. receiver differential impedance measured connector must ±10, impedance between shorted terminals ground (C') must ±15.
GENERATOR BALANCED INTERCONNECTING CABLE LOAD CABLE TERMINATION RECEIVER
Figure Typical V.35 Interface
51.5 51.5 RECEIVER LTC2847
2847
Figure V.35 Receiver Configuration
Figure Charge Pump
sn2847 2847fs
V.35 mode, both switches inside LTC2847 connecting network impedance shown Figure input impedance receiver placed parallel with network termination, does affect overall input impedance significantly. generator differential impedance must impedance between shorted terminals ground must ±15. No-Cable Mode no-cable mode intended case when cable disconnected from connector. charge pump, bias circuitry, drivers receivers turned off, driver outputs forced into high impedance state, supply current transceiver drops less than 300µA while supply current drops less than 10µA. Note that LTC2847's receivers continue terminated differential impedance. Charge Pump LTC2847 uses internal capacitive charge pump generate shown Figure voltage doubler generates about voltage inverter generates about 7.5V VEE. Four surface mounted tantalum ceramic capacitors required capacitor should minimum 3.3µF. capacitors should placed close possible LTC2847 reduce EMI. Receiver Fail-Safe LTC2847/LTC2845 receivers feature fail-safe operation modes. receiver inputs left floating shorted together termination resistor, receiver output will always forced logic high.
LTC2847 3.3µF
2847 2847
LTC2847
TYPICAL APPLICATIO
Operation DCE/DTE acts enable Driver 3/Receiver LTC2847, Driver 3/Receiver LTC2845. LTC2847/LTC2845 configured either operation ways: dedicated port with connector appropriate gender port with connector that configured operation rerouting signals LTC2847/LTC2845 using dedicated cable dedicated cable. dedicated port using DB-25 male connector shown Figure interface mode selected logic outputs from controller from jumpers either mode select pins. dedicated port using DB-25 female connector shown Figure port with DB-25 connector, that configured either operation shown Figure configuration requires separate cables proper signal routing operation. example, mode, signal routed Pins LTC2847's Driver mode, Driver routes signal Pins Power Dissipation Calculations LTC2847 takes VCC. turn produced from with internal charge pump approximately efficiency respectively. Current drawn internally from translates directly into higher ICC. LTC2847 dissipates power according equation: PDISS(2847) refers power dissipated each driver receiver termination cable while number drivers. Conversely, current from drivers dissipate power internal receiver termination where number receivers. LTC2847 Power Dissipation Consider LTC2847 X.21, mode (three V.11 drivers V.11 receivers). From Electrical Characteristics Table, load 14mA, full load 100mA. Each receiver termination (RRT) current going into each receiver termination (100mA 14mA)/3 28.7mA (IRT). (IRT)2 From Equation (2), 82.4mW from Equation (1), power dissipation PDISS(2847) 100mA 82.4mW 82.4mW 418mW. Consider above example running baud rate 10MBd. From Typical Characteristic "V.11 Mode Data Rate," 10MBd 160mA. increases with baud rate driver transient dissipation. From Equation (1), power dissipation PDISS(2847) 160mA 82.4mW 82.4mW 718mW. LTC2845 Power Dissipation LTC2845 used form complete port with LTC2847, will running X.21 mode (three V.11 drivers V.10 drivers, V.11 receivers V.10 receivers, with internal termination). addition VCC, uses outputs from LTC2847. Negligible power dissipated large internal receiver termination LTC2845 term Equation omitted. Thus Equation modified follows: PDISS(2845) (VCC ICC) (VDD IDD) (VEE IEE)
Since power drawn from supplies LTC2847 (VDD VEE) less than 100% efficiency, LTC2847 dissipates extra power source PDISS(2845) PDISS1(2847) 125% (VDD IDD) 143% (VEE IEE) PDISS(2845) (VDD IDD) (VEE IEE) From LTC2845 Electrical Characteristics Table, 5.5V:
load full load with drivers high load full load with both V.10 drivers load full load 2.7mA 110mA 23mA 0.3mA 0.3mA
sn2847 2847fs
LTC2847
TYPICAL APPLICATIO
LTC2847 CHARGE PUMP 3.3µF
SCTE
(114) (115) (104) SHIELD
DCE/DTE
LTC2845
D4ENB R4EN 3.3V *OPTIONAL
DCE/DTE
Figure Controller-Selectable Multiprotocol Port with DB-25 Connector
sn2847 2847fs
(103) SCTE (113) SCTE
3.3V
DB-25 MALE CONNECTOR
(105) (108)
(109) (107) (106) (141) (125)
(142) (140)
2847
LTC2847
TYPICAL APPLICATIO
LTC2847 CHARGE PUMP 3.3µF
(114) SCTE (113) SCTE (103) SGND (102) SHIELD (101) DB-25 FEMALE CONNECTOR
SCTE
DCE/DTE
LTC2845
D4ENB R4EN 3.3V
DCE/DTE
Figure Controller-Selectable Port with DB-25 Connector
sn2847 2847fs
(104) (115)
3.3V
(106) (107)
(109) (108) (105) (125) (141)
*OPTIONAL
(140) 9142)
2847
LTC2847
TYPICAL APPLICATIO
DTE_TXD/DCE_RXD LTC2847 CHARGE PUMP 3.3µF SCTE SCTE
DTE_SCTE/DCE_RXC
DTE_TXC/DCE_TXC
SHIELD DB-25 CONNECTOR SCTE SCTE
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DCE/DTE
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
LTC2845 DTE_DCD/DCE_DCD DTE_DSR/DCE_DTR DTE_CTS/DCE_RTS
DTE_LL/DCE_RI DTE_RI/DCE_LL
DTE_TM/DCE_RL DTE_RL/DCE_M0 DCE/DTE
D4ENB R4EN 3.3V
DCE/DTE
Figure Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
sn2847 2847fs
3.3V
*OPTIONAL
2847
LTC2847
PACKAGE DESCRIPTIO
5.50 0.05 SIDES) 4.10 0.05 SIDES) 3.20 0.05 SIDES)
5.00 0.10 SIDES)
MARK (SEE NOTE
7.00 0.10 SIDES)
0.75 0.05
NOTE: DRAWING CONFORMS JEDEC PACKAGE OUTLINE M0-220 VARIATION WHKD DRAWING SCALE DIMENSIONS MILLIMETERS
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
Package 38-Lead Plastic (5mm 7mm)
(Reference 05-08-1701)
0.70 0.05 PACKAGE OUTLINE 0.25 0.05 0.50 5.20 0.05 SIDES) 6.10 0.05 SIDES) 7.50 0.05 SIDES) RECOMMENDED SOLDER LAYOUT 0.75 0.05 0.00 0.05 3.15 0.10 SIDES) 0.435 0.18 0.18 0.23 5.15 0.10 SIDES) 0.40 0.10 0.200 0.25 0.05 0.200 0.00 0.05 0.50 0.115
(UH) 0303
BOTTOM VIEW-EXPOSED
DIMENSIONS EXPOSED BOTTOM PACKAGE INCLUDE MOLD FLASH. MOLD FLASH, PRESENT, SHALL EXCEED 0.20mm SIDE EXPOSED SHALL SOLDER PLATED SHADED AREA ONLY REFERENCE LOCATION BOTTOM PACKAGE
sn2847 2847fs
LTC2847
TYPICAL APPLICATIO
V.11 drivers driven between while V.10 drivers driven between VEE. Assume that V.11 driver outputs high V.10 driver outputs low. Current going into each V.11 receiver termination (110mA 2.7mA) 23mA/3 28.1mA. Current going into each V.10 receiver termination 23mA 2mA/2 10.5mA. From Equation (2), V.11 79mW V.10 49.6mW. From Equation (3), PDISS(2845) (110mA 23mA) 0.3mA) 5.5V 23mA 79mW 49.6mW 228mW. Since LTC2845 runs slow control signals, power dissipation assumed equal power dissipation. extra power dissipated LTC2847 LTC2845 given Equation(4), PDISS1(2847) 0.3mA) (5.5V 23mA) 55mW. X.21 port running 10MBd, LTC2847 dissipates approximately 718mW 55mW 773mW while LTC2845 dissipates 228mW.
RELATED PARTS
PART NUMBER
LTC1321 LTC1334 LTC1343 LTC1344A LTC1345 LTC1346A LTC1543 LTC1544 LTC1545 LTC1546 LTC2844 LTC2845 LTC2846
DESCRIPTION
Dual RS232/RS485 Transceiver Single RS232/RS485 Multiprotocol Transceiver Software-Selectable Multiprotocol Transceiver Software-Selectable Cable Terminator Single Supply V.35 Transceiver Dual Supply V.35 Transceiver Software-Selectable Multiprotocol Transceiver Software-Selectable Multiprotocol Transceiver Software-Selectable Multiprotocol Transceiver Software-Selectable Multiprotocol Transceiver 3.3V Software-Selectable Multiprotocol Transceiver 3.3V Software-Selectable Multiprotocol Transceiver 3.3V Software-Selectable Multiprotocol Transceiver
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507
COMMENTS
RS232 Driver/Receiver Pairs RS485 Driver/Receiver Pairs RS232 Driver/Receiver Four RS232 Driver/Receiver Pairs 4-Driver/4-Receiver Data Clock Signals Perfect Terminating LTC1543 (Not Needed with LTC1546) 3-Driver/3-Receiver Data Clock Signals 3-Driver/3-Receiver Data Clock Signals Terminated with LTC1344A Data Clock Signals, Companion LTC1544 LTC1545 Control Signals Companion LTC1546 LTC1543 Control Signals Including 5-Driver/5-Receiver Companion LTC1546 LTC1543 Control Signals Including 3-Driver/3-Receiver with Termination Data Clock Signals Companion LTC2846 Control Signals Including 5-Driver/5-Receiver Companion LTC2846 LTC2847 Control Signals Including 3.3V Supply, 3-Driver/3-Receiver with Termination Data Clock Signals, Generates Required Supplies LTC2846 Companion Parts
sn2847 2847fs LT/TP 0603 PRINTED
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DESCRIPTIO Software-Selectable Transceiver Supports: RS232, RS449

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