DESCRIPTIO Four RS232 Transceivers RS485 Transceivers Chip Operat
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LTC1334 Single RS232/RS485 Multiprotocol Transceiver
DESCRIPTIO
Four RS232 Transceivers RS485 Transceivers Chip Operates from Single Supply Withstands Repeated ±10kV Pulses Uses Small Charge Pump Capacitors: 0.1µF Supply Current: Typical 10µA Supply Current Shutdown Self-Testing Capability Loopback Mode Power-Up/Down Glitch-Free Outputs Driver Maintains High Impedance Three-State, Shutdown with Power Thermal Shutdown Protection Receiver Inputs Withstand ±25V
®1334 power CMOS bidirectional transceiver featuring reconfigurable interface ports. configured RS485 differential ports, dual RS232 single-ended ports RS485 differential port dual RS232 single-ended port. onboard charge pump requires four 0.1µF capacitors generate boosted positive negative supplies, allowing RS232 drivers meet RS232 output swing requirement with only single supply. shutdown mode reduces supply current 10µA. RS232 transceivers full compliance with RS232 specifications. RS485 transceivers full compliance with RS485 RS422 specifications. interface drivers feature short-circuit thermal shutdown protection. enable allows RS485 driver outputs forced into high impedance, which maintained even when outputs forced beyond supply rails power off. Both driver outputs receiver inputs feature ±10kV protection. loopback mode allows driver outputs connected back receiver inputs diagnostic self-test.
registered trademarks Linear Technology Corporation.
APPLICATIONS
Power RS485/RS422/RS232/EIA562 Interface Software-Selectable Multiprotocol Interface Port Cable Repeaters Level Translators
TYPICAL APPLICATI
LTC1334 VCC1 ENABLE CAPACITORS: 0.1µF MONOLITHIC CERAMIC TYPE RS232 INTERFACE 4000-FT 24-GAUGE TWISTED PAIR RS485 INTERFACE
LTC1334 VCC2 ENABLE
LTC1334 TA01
LTC1334 ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW
Supply Voltage (VCC) 6.5V Input Voltage Drivers 0.3V (VCC 0.3V) Receivers ON/OFF, SEL1, SEL2 0.3V (VCC 0.3V) Output Voltage Drivers Receivers 0.3V (VCC 0.3V) Short-Circuit Duration Output Indefinite VDD, VEE, C1+, C1-, C2+, Operating Temperature Range Commercial 70°C Industrial 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1334CNW LTC1334CSW LTC1334ISW
SEL1 SEL2
DZ1/DE1 ON/OFF DZ2/DE2
PACKAGE PACKAGE 28-LEAD PDIP WIDE 28-LEAD PLASTIC WIDE
TJMAX 125°C, 56°C/W (NW) TJMAX 125°C, 85°C/W (SW)
Consult factory Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL VOD1 VOD2 IOSD IOZD IOSD PARAMETER Differential Driver Output Voltage (Unloaded) Differential Driver Output Voltage (With Load) Change Magnitude Driver Differential Output Voltage Complementary Output States Driver Common Mode Output Voltage Change Magnitude Driver Common Mode Output Voltage Complementary Output States Driver Short-Circuit Current Three-State Output Current Output Voltage Swing Output Short-Circuit Current Input High Voltage Input Voltage Input Current RS485 Driver (SEL1 SEL2 High)
0.1µF (Notes
CONDITIONS
UNITS
Figure (RS422) Figure (RS485) Figure Figure Figure 12V, High 12V, (Note Figure Positive Figure Negative ON/OFF, SEL1, SEL2, ON/OFF, SEL1, SEL2, SEL1, SEL2 ON/OFF,
±500
RS232 Driver (SEL1 SEL2 Low)
Driver Inputs Control Inputs
LTC1334
ELECTRICAL CHARACTERISTICS
SYMBOL IOSR IOZR PARAMETER Differential Input Threshold Voltage Input Hysteresis Input Current Input Resistance Receiver Input Threshold Voltage Receiver Input Hysteresis Receiver Input Resistance Receiver Output High Voltage Receiver Output Voltage Short-Circuit Current Three-State Output Current Inactive Output Pull-Up Resistance (Note Output Voltage Output Voltage RS485 Receiver (SEL1 SEL2 High)
0.1µF (Notes
CONDITIONS 12V, LTC1334C LTC1334I Input Threshold Input High Threshold
UNITS
-0.3
RS232 Receiver (SEL1 SEL2 Low)
Receiver Output 3mA, SEL1 SEL2 3mA, SEL1 SEL2 ON/OFF ON/OFF High, SEL1 SEL2 High Load, ON/OFF High 10mA, ON/OFF High Load, ON/OFF High 10mA, ON/OFF High Load, SEL1 SEL2 High Load Shutdown, ON/OFF
Power Supply Generator
Power Supply Supply Current
ELECTRICAL CHARACTERISTICS
SYMBOL tPLH tPHL tPLH tPHL tSKEW PARAMETER Slew Rate Transition Time Driver Input Output Driver Input Output Receiver Input Output Receiver Input Output Driver Input Output Driver Input Output Driver Output Output Driver Rise Fall Time RS232 Mode (SEL1 SEL2 Low)
0.1µF (Notes
CONDITIONS Figure 15pF Figure 1000pF Figure 2500pF Figures 15pF Figures 15pF Figures Figures Figures 100pF Figures 100pF Figures 100pF Figures 100pF
UNITS V/µs V/µs
0.22
RS485 Mode (SEL1 SEL2 High)
LTC1334
ELECTRICAL CHARACTERISTICS
SYMBOL tSKEW PARAMETER Driver Enable Output Driver Enable Output High Driver Disable from Driver Disable from High Receiver Input Output Receiver Input Output Differential Receiver Skew, tPLH tPHL RS485 Mode (SEL1 SEL2 High)
0.1µF (Notes
CONDITIONS Figures 100pF, Closed Figures 100pF, Closed Figures 15pF, Closed Figures 15pF, Closed Figures 100pF Figures 100pF Figures 100pF
UNITS
denotes specifications which apply over full operating temperature range. Note Absolute Maximum Ratings those values beyond which safety device cannot guaranteed. Note currents into device pins positive; currents device pins negative. voltages referenced device ground unless otherwise specified. Note typicals given 0.1µF 25°C.
Note Short-circuit current RS485 driver output state folds back above VCC. Peak current occurs around Note RS232 receiver output disabled RS485 mode (SEL1 SEL2 high). unused output driver goes into high impedance mode resistor VCC. Applications Information section more details.
TYPICAL PERFORMANCE CHARACTERISTICS
Receiver Output High Voltage Temperature
IOUT IOUT
OUTPUT VOLTAGE
TEMPERATURE (°C)
OUTPUT VOLTAGE
TIME (ns)
LTC1334 TPC01
Receiver Output Voltage Temperature
TEMPERATURE (°C)
RS485 Receiver Skew tPLH tPHL Temperature
TEMPERATURE (°C)
LTC1334 TPC02
LTC1334 TPC03
LTC1334 TYPICAL PERFORMANCE CHARACTERISTICS
Receiver Output Current Output High Voltage
OUTPUT CURRENT (mA) OUTPUT VOLTAGE
OUTPUT VOLTAGE
INPUT THRESHOLD VOLTAGE
25°C
OUTPUT CURRENT (mA)
Charge Pump Output Voltage Temperature
(-10mA LOAD)
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
OUTPUT VOLTAGE
LOAD)
(10mA LOAD) LOAD) TEMPERATURE (°C)
RS485 Driver Differential Output Voltage Temperature
DIFFERENTIAL OUTPUT VOLTAGE
DIFFERENTIAL OUTPUT CURRENT (mA)
TIME (µs)
TEMPERATURE (°C)
LTC1334 TPC04
LTC1334 TPC07
Receiver Output Current Output Voltage
25°C
RS232 Receiver Input Threshold Voltage Temperature
INPUT HIGH
INPUT
TEMPERATURE (°C)
LTC1334 TPC05
LTC1334 TPC06
Supply Current Temperature (RS485)
LOAD HIGH
Supply Current Temperature (RS232)
LOAD HIGH
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1334 TPC08
LTC1334 TPC09
RS485 Driver Differential Output Current Output Voltage
RS485 Driver Skew Temperature
25°C
DIFFERENTIAL OUTPUT VOLTAGE
TEMPERATURE (°C)
LTC1334 TPC10
LTC1334 TPC11
LTC1334 TPC12
LTC1334 TYPICAL PERFORMANCE CHARACTERISTICS
RS485 Driver Output High Voltage Output Current
25°C
OUTPUT CURRENT (mA)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE
RS232 Driver Output Voltage Temperature
OUTPUT SHORT-CIRCUIT CURRENT (mA)
OUTPUT HIGH
OUTPUT LEAKAGE CURRENT (µA)
OUTPUT VOLTAGE
TEMPERATURE (°C) OUTPUT
FUNCTIONS
(Pin Commutating Capacitor Positive Terminal. Requires 0.1µF external capacitor between Pins (Pin Commutating Capacitor Negative Terminal. (Pin Positive Supply Output RS232 Drivers. Requires external 0.1µF capacitor ground. (Pin Receiver Input. (Pin Receiver Input. (Pin Driver Output. (Pin Driver Output. SEL1 (Pin Interface Mode Select Input. SEL2 (Pin Interface Mode Select Input. (Pin 10): Driver Output. (Pin 11): Driver Output. (Pin 12): Receiver Input. (Pin 13): Receiver Input. (Pin 14): Ground. (Pin 15): Negative Supply Output. Requires external 0.1µF capacitor ground.
LTC1334 TPC13
LTC1334 TPC16
RS485 Driver Output Voltage Output Current
25°C
RS485 Driver Output Short-Circuit Current Temperature
SINK (VOUT
SOURCE (VOUT
OUTPUT VOLTAGE
TEMPERATURE (°C)
LTC1334 TPC14
LTC1334 TPC15
RS232 Driver Short-Circuit Current Temperature
VOUT SOURCE
Driver Output Leakage Current (Disable/Shutdown) Temperature
SINK
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1334 TPC17
LTC1334 TPC18
LTC1334
CTIO
(Pin 16): Receiver Output. (Pin 17): Receiver Output. DZ2/DE2 (Pin 18): RS232 Driver Input RS232 Mode. RS485 Driver Enable with internal pull-up RS485 mode. (Pin 19): Driver Input. ON/OFF (Pin 20): high logic input enables transceivers. puts device into shutdown mode reduces 10µA. This internal pull-up. (Pin 21): Loopback Control Input. logic level enables internal loopback connections. This internal pull-up. (Pin 22): Driver Input. DZ1/DE1 (Pin 23): RS232 Driver Input RS232 Mode. RS485 Driver Enable with internal pull-up RS485 mode. (Pin 24): Receiver Output. (Pin 25): Receiver Output. (Pin 26): Positive Supply; 4.75V 5.25V (Pin 27): Commutating Capacitor Negative Terminal. Requires 0.1µF external capacitor between Pins (Pin 28): Commutating Capacitor Positive Terminal.
SEL1 SEL2 DZ1/DE1 ON/OFF DZ2/DE2
CTIO TABLES
RS485 Driver Mode
ON/OFF INPUTS CONDITIONS Fault Fault Thermal Fault OUTPUTS
RS485 Receiver Mode
ON/OFF INPUTS 0.2V 0.2V Inputs Open OUTPUTS
*See Note Electrical Characteristics table.
RS232 Driver Mode
ON/OFF INPUTS CONDITIONS Fault Fault Thermal Fault OUTPUTS
RS232 Receiver Mode
ON/OFF INPUTS Inputs Open OUTPUTS
LTC1334
BLOCK DIAGRA
Interface Configuration with Loopback Disabled
PORT RS232 MODE PORT RS232 MODE SEL1 SEL1 PORT RS485 MODE PORT RS232 MODE SEL1 PORT RS232 MODE PORT RS485 MODE SEL1 PORT RS485 MODE PORT RS485 MODE
SEL2
PORT RS232 MODE PORT RS232 MODE SEL1 SEL1
SEL2
SEL2
SEL2
SEL2
LTC1334 BD01
Interface Configuration with Loopback Enabled
PORT RS485 MODE PORT RS232 MODE SEL1 PORT RS232 MODE PORT RS485 MODE SEL2 SEL1 PORT RS485 MODE PORT RS485 MODE
SEL2
SEL2
LTC1334 BD02
LTC1334 TEST CIRCUITS
LTC1334
15pF
LTC1334
LTC1334
Figure RS422/RS485 Driver Test Load
Figure RS485 Driver/Receiver Timing Test Circuit
Figure RS485 Driver Output Enable/Disable Timing Test Load
VOUT 15pF
LTC1334
LTC1334
Figure RS232 Driver Swing/Timing Test Circuit
Figure RS232 Receiver Timing Test Circuit
SWITCHI WAVEFOR
tPLH 1.5V
tSKEW tSKEW
LTC1334
1MHz: 10ns: 10ns
1.5V tPHL
VDIFF V(Z) V(Y)
Figure RS485 Driver Propagation Delays
LTC1334
SWITCHI WAVEFOR
LTC1334
tPLH
tPHL
LTC1334
1.5V
tPHL 0.8V tPLH 2.4V
LTC1334
1.3V
Figure RS232 Receiver Propagation Delays
1.5V
1MHz: 10ns: 10ns
1.5V
2.3V OUTPUT NORMALLY OUTPUT NORMALLY HIGH 2.3V 0.5V 0.5V
Figure RS485 Driver Enable Disable Times
1MHz: 10ns: 10ns
INPUT
tPHL 1.5V
LTC1334
OUTPUT 1.5V
Figure RS485 Receiver Propagation Delays
1.5V tPLH
Figure RS232 Driver Propagation Delays
1.7V
LTC1334
APPLICATI
ATIO
Basic Theory Operation LTC1334 interface ports. Each port configured pair single-ended RS232 transceivers differential RS485 transceiver forcing port's selection input high, respectively. LTC1334 provides RS232 drivers RS232 receivers RS485 driver RS485 receiver port. interface drivers feature three-state outputs. Interface outputs forced into high impedance when driver disabled, shutdown mode with power off. interface driver outputs fault-protected current limiting thermal shutdown circuit. thermal shutdown circuit disables both RS232 RS485 driver outputs when temperature reaches 150°C. thermal shutdown circuit reenables drivers when temperature cools 130°C. RS485 mode, shutdown mode with power off, input resistance receiver 24k. input resistance drops RS232 mode. logic ON/OFF shuts down device forces outputs into high impedance state. logic high enables device. internal current source pulls ON/OFF high left open. RS485 mode, internal current source pulls driver enable high left open. RS485 receiver current source noninverting input. both RS485 receiver inputs open, output goes high state. Both current sources disabled RS232 mode. receiver output inactive RS485 mode pull-up resistor provide known output state this mode. loopback mode enables internal connections from driver outputs receiver inputs self-test when logic state. driver outputs isolated from external loads. This allows transmitter verification under loaded condition. internal current source pulls high left open disables loopback configuration. RS232/RS485 Applications LTC1334 support both RS232 RS485 levels with single supply shown Figure
0.1µF RS485
0.1µF
INTO LOAD
RS232 RS232 RS232 RS232
Figure RS232/RS485 Interfaces
LTC1334 0.1µF 0.1µF ENABLE 0.1µF
LTC1334
LTC1334
APPLICATI
ATIO
LTC1334 0.1µF 0.1µF
0.1µF 0.1µF INPUT INPUT PORT INTERFACE OUTPUT
SEL1
OUTPUT
IN/ENABLE ON/OFF
INPUT INPUT PORT INTERFACE OUTPUT
SEL2 IN/ENABLE
LTC1334
OUTPUT
0.1µF
Figure Multiprotocol Interface
LTC1334 ENABLE LTC1334
Figure Typical Connection RS485 Interface
Multiprotocol Applications
LTC1334 well-suited software controlled interface mode selection. Each port selection shown Figure single-ended transceivers support both RS232 EIA562 levels. differential transceivers support both RS485 RS422. Typical Applications typical RS232/EIA562 interface application shown Figure with LTC1334.
LTC1334
LTC1334
LTC1334 RS232/ EIA562 LINES
INTERFACE
Figure Typical Connection RS232/EIA562 Interface
typical connection RS485 transceiver shown Figure twisted pair wires connects drivers receivers half duplex multipoint data transmission. wires must terminated both ends with resistors equal wire's characteristic impedance. optional shield around twisted pair helps reduce unwanted noise should connected ground only end.
LTC1334 ENABLE
ENABLE
LTC1334
LTC1334
APPLICATI
ATIO
typical RS422 connection (Figure allows driver receivers twisted pair wires terminated with resistor end. typical twisted-pair line repeater shown Figure data transmission rate drops with increased cable length, repeaters inserted improve transmission rate transmit beyond RS422 4000-foot limit. LTC1334 used translate RS232 RS422 interface levels vice versa shown Figure
ENABLE
LTC1334
Figure Typical Connection RS422 Interface
LTC1334
LTC1334
LTC1334
Figure Typical Cable Repeater RS422 Interface
RS232/EIA562 RS422
LTC1334
Figure Typical Cable Extension RS232/EIA562 Interface
port configured RS232 transceiver other RS485 transceiver. Using LTC1334s level translators, RS232/ EIA562 interface distance extended 4000 feet with twisted-pair wires (Figure 18). AppleTalk®/LocalTalk® Applications AppleTalk applications shown Figure with LTC1323 LTC1334.
AppleTalk LocalTalk registered trademarks Apple Computer, Inc.
LTC1334 LTC1334
LTC1334
ENABLE
RS232/EIA562
RS422
LTC1334
Figure Typical RS232/EIA562 RS422 Level Translator
LTC1334
LTC1334
RS232/EIA562
LTC1334
APPLICATI
0.33µF TXDEN SHDN RXEN RXDO
ATIO
0.33µF
LTC1323CS-16 0.1µF CHARGE PUMP
100pF 100pF 100pF FERRITE BEAD FERRITE BEAD
Figure AppleTalk/LocalTalk Implemented Using LTC1323CS-16 LTC1334 Transceivers
LTC1323CS 0.33µF CPEN TXDEN SHDN RXEN RXDO RXD- RXD+ CHARGE PUMP 0.33µF
100pF 100pF
0.1µF
SEL2
Figure AppleTalk Direct Connect Using LTC1323 LTC1334 Transceivers
0.1µF LTC1334 0.1µF
LTC1334
0.1µF
SEL1, SEL2,
FERRITE BEAD
FERRITE BEAD
100pF 0.1µF SEL1 0.1µF
LTC1334
LTC1334 0.1µF
LTC1334
PACKAGE DESCRIPTION
0.505 0.560* (12.827 14.224)
0.600 0.625 (15.240 15.875)
0.150 0.005 (3.810 0.127) 0.015 (0.381)
0.009 0.015 (0.229 0.381) +0.025 0.625 -0.015
+0.635 15.87 -0.381
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.010 INCH (0.254mm)
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.
Dimensions inches (millimeters) unless otherwise noted.
Package 28-Lead PDIP (Wide 0.600)
(LTC 05-08-1520)
1.455* (36.957)
0.045 0.065 (1.143 1.651)
0.070 (1.778) 0.125 (3.175) 0.005 (0.127) 0.100 0.010 (2.540 0.254) 0.018 0.003 (0.457 0.076)
0695
LTC1334
PACKAGE DESCRIPTION
0.291 0.299** (7.391 7.595) 0.010 0.029 (0.254 0.737)
0.009 0.013 (0.229 0.330)
NOTE 0.016 0.050 (0.406 1.270)
NOTE: IDENT, NOTCH CAVITIES BOTTOM PACKAGES MANUFACTURING OPTIONS. PART SUPPLIED WITH WITHOUT OPTIONS *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
RELATED PARTS
PART NUMBER LTC485 1137A LTC1320 LTC1321/LTC1322/LTC1335 LTC1323 LTC1347 DESCRIPTION Power RS485 Interface Transceiver Power RS232 Transceiver AppleTalk Transceiver RS232/EIA562/RS485 Transceivers Single AppleTalk Transceiver Power RS232 Transceiver COMMENTS Single Supply, Wide Common Mode Range ±15kV IEC-801 Protection, Three Drivers, Five Receivers AppleTalk/Local Talk Compliant Configurable, 10kV Protection LocalTalk/AppleTalk Compliant 10kV Three Drivers/Five Receivers, Five Receivers Alive Shutdown
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
Dimensions inches (millimeters) unless otherwise noted.
Package 28-Lead Plastic Small Outline (Wide 0.300)
(LTC 05-08-1690)
0.697 0.712* (17.70 18.08)
NOTE
0.394 0.419 (10.007 10.643)
0.093 0.104 (2.362 2.642)
0.037 0.045 (0.940 1.143)
0.050 (1.270)
0.014 0.019 (0.356 0.482)
0.004 0.012 (0.102 0.305)
(WIDE) 0695
LT/GP 0396 PRINTED
LINEAR TECHNOLOGY CORPORATION 1995
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