DESCRIPTIO Software-Selectable Transceiver Supports: RS232, RS449

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DESCRIPTIO Software-Selectable Transceiver Supports: RS232, RS449

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LTC1543 Software-Selectable Multiprotocol Transceiver
DESCRIPTIO
Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 TUV/Detecon Inc. Certified NET1 NET2 Compliant (Test Report NET2/102201/97) TBR2 Compliant (Test Report CTR2/022701/98) Software-Selectable Cable Termination Using LTC1344A Complete Port with LTC1544, LTC1344A Operates from Single Supply
LTC1543 3-driver/3-receiver multiprotocol transceiver that operates from single supply. LTC1543 LTC1544 form core complete softwareselectable interface port that supports RS232, RS449, EIA530, EIA530-A, V.35, V.36 X.21 protocols. Cable termination implemented using LTC1344A software-selectable cable termination chip using existing discrete designs. LTC1543 runs from single supply using internal charge pump that requires only five space-saving surface mounted capacitors. part available 28-lead SSOP surface mount package.
registered trademarks Linear Technology Corporation.
APPLICATIO
Data Networking Data Routers
TYPICAL APPLICATIO
Multiprotocol Serial Interface with DB-25 Connector
SCTE
LTC1544
LTC1543
(141)
(106)
(107)
(109)
(108) (105) SHIELD (101)
(102)
(104)
(115)
SCTE SCTE (113) (103) (114)
DB-25 CONNECTOR
LTC1344A
1543 TA01
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LTC1543
ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW D3/R1 D3/R1 PACKAGE 28-LEAD PLASTIC SSOP CHARGE PUMP
Supply Voltage 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 (VCC 0.3V) Logic Pins 0.3V (VCC 0.3V) 0.3V 0.3V Short-Circuit Duration Transmitter Output Indefinite Receiver Output Indefinite Operating Temperature Range LTC1543C 70°C LTC1543I 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1543CG LTC1543IG
DCE/DTE
TJMAX 150°C, 90°C/
Consult Marketing parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
ture range. (Notes
SYMBOL Supplies Supply Current (DCE Mode, Digital Pins VCC) PARAMETER
denotes specifications which apply over full operating temperaMIN
CONDITIONS RS530, RS530-A, X.21 Modes, Load RS530, RS530-A, X.21 Modes, Full Load V.35 Mode, Load V.35 Mode, Full Load V.28 Mode, Load V.28 Mode, Full Load No-Cable Mode RS530, RS530-A, X.21 Modes, Full Load V.35 Mode, Full Load V.28 Mode, Full Load Mode, Load V.28 Mode, with Load V.28 Mode, with Load, 10mA V.28, V.35 Modes, Load V.28 Mode, Full Load V.35 Mode, Full Load RS530, RS530-A, X.21 Modes, Full Load No-Cable Mode Power-Up Turn
UNITS
Internal Power Dissipation (DCE Mode)
Positive Charge Pump Output Voltage
Negative Charge Pump Output Voltage
fOSC
Charge Pump Oscillator Frequency Supply Rise Time Logic Input High Voltage Logic Input Voltage
Logic Inputs Outputs
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LTC1543
ELECTRICAL CHARACTERISTICS
ture range. (Notes
SYMBOL PARAMETER Logic Input Current CONDITIONS (LTC1543C) (LTC1543I) VCC, 1.95k (Figure (Figure (Figure (Figure (Figure (Figure VOUT 0.25V 0.25V, Power No-Cable Mode Driver Disabled (Figures (LTC1543C) (Figures (LTC1543I) (Figures (LTC1543C) (Figures (LTC1543I) (Figures (LTC1543C) (Figures (LTC1543I) (Figures (LTC1543C) (Figures (LTC1543I) (Figures VA,B VA,B (Figures (Figures (LTC1543C) (Figures (LTC1543I) (Figures (LTC1543C) (Figures (LTC1543I) (Figures (LTC1543C) (Figures (LTC1543I) Open Circuit With Load, (Figure
denotes specifications which apply over full operating temperaMIN 0.5VODO 0.67VODO ±10.00 ±0.66 ±0.66 ±100 UNITS
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IOSR IOZR V.11 Driver VODO VODL SKEW V.35 Driver
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 Input Output Input Output Difference, tPLH tPHL Output Output Skew Input Threshold Voltage Input Hysteresis Input Current Input Impedance Rise Fall Time Input Output Input Output Input Output Difference, tPLH tPHL
V.11 Receiver
Differential Output Voltage Transmitter Output High Current Transmitter Output Current
±0.44
±0.55
LTC1543
ELECTRICAL CHARACTERISTICS
ture range. (Notes
SYMBOL SKEW tPLH tPHL V.28 Driver VTHL VTLH tPLH tPHL Output Voltage Short-Circuit Current Output Leakage Current Slew Rate Input Output Input Output Input Threshold Voltage Input High Threshold Voltage Receiver Input Hysteresis Receiver Input Impedance Rise Fall Time Input Output Input Output (Figures (Figures (Figures
denotes specifications which apply over full operating temperaCONDITIONS 0.25V 0.25V (Figures (Figures (LTC1543C) (Figures (LTC1543I) (Figures (LTC1543C) (Figures (LTC1543I) (Figures (LTC1543C) (Figures (LTC1543I) (Figures VB)/2 (Figure VB)/2 (Figure VA,B VA,B (Figures (Figures (LTC1543C) (Figures (LTC1543I) (Figures (LTC1543C) (Figures (LTC1543I) (Figures (LTC1543C) (Figures (LTC1543I) Open Circuit (Figure VOUT 0.25V 0.25V, Power No-Cable Mode Driver Disabled 2500pF (Figures 2500pF (Figures 2500pF (Figures
PARAMETER Transmitter Output Leakage Current Rise Fall Time Input Output Input Output Input Output Difference, tPLH tPHL Output Output Skew Differential Receiver Input Threshold Voltage Receiver Input Hysteresis Receiver Input Current Receiver Input Impedance Rise Fall Time Input Output Input Output Input Output Difference, tPLH tPHL
±100
UNITS
V.35 Receiver ±150 0.05 ±100 ±0.66 V/µs
±8.5
V.28 Receiver
Note Absolute Maximum Ratings those beyond which safety device impaired. Note currents into device pins positive; currents device negative. voltages referenced device ground unless otherwise specified.
Note typicals given CVCC 1µF, CVDD CVEE 3.3µF tantalum capacitors 25°C.
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LTC1543
CTIO
(Pin Capacitor Negative Terminal. Connect capacitor between C1-. (Pin Capacitor Positive Terminal. Connect capacitor between (Pin Generated Positive Supply Voltage V.28. Connect capacitor ground. (Pin Positive Supply Voltage Input. 4.75V 5.25V. Bypass with capacitor ground. (Pin Level Driver Input. (Pin Level Driver Input. (Pin Level Driver Input. (Pin CMOS Level Receiver Output. (Pin CMOS Level Receiver Output. (Pin 10): CMOS Level Receiver Output. (Pin 11): Level Mode Select Input with Pull-Up VCC. (Pin 12): Level Mode Select Input with Pull-Up VCC. (Pin 13): Level Mode Select Input with Pull-Up VCC. DCE/DTE (Pin 14): Level Mode Select Input with PullUp VCC. (Pin 15): Receiver Noninverting Input with Pull-Up VCC. (Pin 16): Receiver Inverting Input. (Pin 17): Receiver Noninverting Input. (Pin 18): Receiver Inverting Input. D3/R1 (Pin 19): Receiver Noninverting Input Driver Noninverting Output. D3/R1 (Pin 20): Receiver Inverting Input Driver Inverting Output. (Pin 21): Driver Noninverting Output. (Pin 22): Driver Inverting Output. (Pin 23): Driver Noninverting Output. (Pin 24): Driver Inverting Output. (Pin 25): Ground. (Pin 26): Negative Supply Voltage. Connect 3.3µF capacitor GND. (Pin 27): Capacitor Negative Terminal. Connect capacitor between (Pin 28): Capacitor Positive Terminal. Connect capacitor between
TEST CIRCUITS
100pF 100pF
Figure V.11 Driver Test Circuit
15pF
1543
1543
Figure V.11 Driver/Receiver Test Circuit
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LTC1543
TEST CIRCUITS
15pF
1543
Figure V.35 Driver/Receiver Test Circuit
15pF
1543
1543
Figure V.10/V.28 Driver Test Circuit
Figure V.10/V.28 Receiver Test Circuit
SELECTIO
LTC1543 MODE NAME 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
DCE/DTE V.11 V.11 V.11 V.11 V.35 V.11 V.28 V.11 V.11 V.11 V.11 V.35 V.11 V.28 V.11 V.11 V.11 V.11 V.35 V.11 V.28 V.11 V.11 V.11 V.11 V.35 V.11 V.28 V.11 V.11 V.11 V.11 V.35 V.11 V.28 V.11 V.11 V.11 V.11 V.35 V.11 V.28 V.11 V.11 V.11 V.11 V.35 V.11 V.28 V.11 V.11 V.11 V.11 V.35 V.11 V.28 V.11 V.11 V.11 V.11 V.35 V.11 V.28 V.11 V.11 V.11 V.11 V.35 V.11 V.28
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LTC1543
SWITCHI WAVEFOR
SKEW SKEW
1543
1.5V
1MHz 10ns 10ns
Figure V.11, V.35 Driver Propagation Delays
VOD2 -VOD2
1.5V
1MHz 10ns 10ns
Figure V.11, V.35 Receiver Propagation Delays
1.5V 1.5V
1543
Figure V.10, V.28 Driver Propagation Delays
1.3V 1.7V 2.4V 0.8V
1543
Figure V.10, V.28 Receiver Propagation Delays
1.5V
VDIFF V(A) V(B)
INPUT
OUTPUT
1.5V
1543
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LTC1543
APPLICATIO ATIO
Overview
LTC1543/LTC1544 form core complete software-selectable interface port that supports RS232, RS449, EIA530, EIA530-A, V.35, V.36 X.21 protocols. Cable termination implemented using LTC1344A software-selectable cable termination chip using existing discrete designs. complete DCE-to-DTE interface operating EIA530 mode shown Figure LTC1543 each port used generate clock data signals. LTC1544 used generate control signals along with (Local Loopback).The LTC1344A cable termination chip used only clock data signals because they must support V.35 cable termination. control signals need external resistors. Mode Selection interface protocol selected using mode select pins (see Mode Selection 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 that LTC1543/ LTC1544 LTC1344A enter no-cable mode when cable removed. no-cable mode LTC1543/LTC1544 supply current drops less than 200µA LTC1543/LTC1544 driver outputs
LTC1344A resistive terminations forced into high impedance state. mode selection also accomplished using jumpers connect mode pins ground VCC. Cable Termination Traditional implementations have included switching resistors with expensive relays, requiring user change termination modules every time interface standard changed. Custom cables have been used with termination cable head separate terminations built board custom cable routes signals appropriate termination. Switching terminations with FETs difficult because FETs must remain even though signal voltage beyond supply voltage drivers power off. Using LTC1344A along with LTC1543/LTC1544 solves cable termination switching problem. software control, LTC1344A provides termination V.10 (RS423), V.11 (RS422), V.28 (RS232) V.35 electrical protocols. V.10 (RS423) Interface typical V.10 unbalanced interface shown Figure V.10 single-ended generator output with ground connected differential receiver with inputs connected input connected signal return ground Usually, cable termination required V.10 interfaces, receiver inputs must compliant with impedance curve shown Figure V.10 receiver configuration LTC1544 shown Figure V.10 mode switch inside LTC1544 turned off.The noninverting input disconnected inside LTC1544 receiver connected ground. cable termination then input impedance ground LTC1544 V.10 receiver.
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LTC1543
APPLICATIO ATIO
SERIAL CONTROLLER LTC1543 LTC1344A LTC1344A
SCTE
LTC1544
Figure Complete Multiprotocol Interface EIA530 Mode
LTC1543 SERIAL CONTROLLER SCTE SCTE LTC1544
1543
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LTC1543
APPLICATIO ATIO
LTC1344A DCE/ (DATA) LTC1543 DCE/DTE (DATA) CONNECTOR
LTC1544 DCE/DTE (DATA)
1543
Figure Single Port V.35 Mode Selection Cable
GENERATOR
Figure Typical V.10 Interface
LATCH CABLE
BALANCED INTERCONNECTING CABLE LOAD CABLE TERMINATION RECEIVER
1543
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LTC1543
APPLICATIO ATIO
-10V
-3.25mA
Figure V.10 Receiver Input Impedance
V.11 (RS422) Interface typical V.11 balanced interface shown Figure V.11 differential generator with outputs with ground connected differential receiver with ground inputs connected connected V.11 interface differential termination receiver that minimum value 100. termination resistor optional V.11 specification, high speed clock data lines, termination required prevent reflections from corrupting data. receiver inputs must also compliant with impedance curve shown Figure V.11 mode, switches except inside LTC1344A which connects differential termination impedance cable shown Figure
3.25mA
LTC1544
RECEIVER
1543
1543
Figure V.10 Receiver Configuration
GENERATOR
BALANCED INTERCONNECTING CABLE
LOAD CABLE TERMINATION RECEIVER
1543
Figure Typical V.11 Interface
51.5 51.5
1543
LTC1344A
LTC1543 LTC1544
RECEIVER
Figure V.11 Receiver Configuration
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LTC1543
APPLICATIO ATIO
V.28 (RS232) Interface
typical V.28 unbalanced interface shown Figure V.28 single-ended generator output with ground connected single-ended receiver with input connected ground connected signal return ground V.28 mode switches except inside LTC1543/LTC1544 which connects (R8) impedance ground parallel with (R5) plus (R6) combined impedance shown Figure noninverting input disconnected inside LTC1543/ LTC1544 receiver connected level reference voltage 1.4V receiver trip point.
BALANCED INTERCONNECTING CABLE
GENERATOR
LOAD CABLE TERMINATION RECEIVER
Figure Typical V.28 Interface
51.5 51.5
1543
LTC1344A
RECEIVER
Figure V.28 Receiver Configuration
V.35 Interface typical V.35 balanced interface shown Figure V.35 differential generator with outputs with ground connected differential receiver with ground inputs connected connected V.35 interface requires delta network termination receiver generator end. receiver differential impedance measured connector must ±10, impedance between shorted terminals ground must ±15. V.35 mode, both switches inside LTC1344A connecting network impedance shown Figure switch LTC1543 off. input
BALANCED INTERCONNECTING CABLE GENERATOR LOAD CABLE TERMINATION RECEIVER
1543
1543
Figure Typical V.35 Interface
LTC1543 LTC1544
51.5 51.5
1543
LTC1543 RECEIVER
LTC1344A
Figure V.35 Receiver Configuration
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LTC1543
APPLICATIO ATIO
impedance receiver placed parallel with network termination, does affect overall input impedance significantly. generator differential impedance must impedance between shorted terminals ground must ±15. generator termination, switches both side center resistor brought bypassed with external capacitor reduce common mode noise shown Figure mismatch driver rise fall times skew driver propagation delays will force current through center termination resistor ground, causing high frequency common mode spike terminals. common mode spike cause problems that reduced capacitor which shunts much common mode energy ground rather than down cable.
LTC1344A
51.5
V.35 DRIVER
51.5 100pF
1543
Figure Charge Pump
Figure V.35 Driver Using LTC1344A
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 drops less than 200µA. Charge Pump LTC1543 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 LTC1543 reduce EMI. Receiver Fail-Safe LTC1543/LTC1544 receivers feature fail-safe operation modes. receiver inputs left floating shorted together termination resistor, receiver output will always forced logic high.
LTC1543 3.3µF
1543
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LTC1543
APPLICATIO ATIO
Operation
DCE/DTE acts enable Driver 3/Receiver LTC1543, Driver 3/Receiver Driver Receiver LTC1544. INVERT LTC1544 allows Driver 4/Receiver enable high true polarity. LTC1543/LTC1544 configured either operation ways: dedicated port with connector appropriate gender port with connector that configured operation rerouting signals LTC1543/LTC1544 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, configured either operation shown Figure configuration requires separate cables proper signal routing operation. example, mode, signal routed Pins Driver LTC1543. mode, Driver routes signal Pins Multiprotocol Interface with DB-25 Connector signals implemented, there enough drivers receivers available LTC1543/ LTC1544. Figure required control signals handled LTC1544 clock/data signals
LTC1343. LTC1343 additional single-ended driver/receiver pair that handle more optional control signals such Cable-Selectable Multiprotocol Interface cable-selectable multiprotocol DTE/DCE interface shown Figure select lines DCE/DTE brought connector. mode selected cable wiring (connector (connector DCE/DTE (connector ground (connector letting them float. DCE/ floating, internal pull-up current sources will pull signals VCC. select hard wired VCC. When cable pulled out, interface will into no-cable mode. Compliance Testing European standard 45001 test report available LTC1543/LTC1544/LTC1344A chipset. copy test report available from Telecom Services Inc. (formerly Detecon Inc.) title report Test Report NET2/102201/97. address Telecom Services Inc. Telecom Services Inc. Type Approval Division 1775 Highway Paul, 55112 Tel. (612) 639-0775 Fax. (612) 639-0873
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LTC1543
TYPICAL APPLICATIO
100pF 100pF 100pF
SCTE LTC1543 CHARGE PUMP 3.3µF
LTC1344A
LATCH
DCE/DTE
(103) SCTE (113) SCTE
DCE/DTE
LTC1544
INVERT
DCE/DTE
Figure Controller-Selectable Multiprotocol Port with DB-25 Connector
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(114) (115) (104) SHIELD
DB-25 MALE CONNECTOR
(105) (108)
(109) (107) (106) (141)
1543
LTC1543
TYPICAL APPLICATIO
100pF 100pF 100pF LTC1543 CHARGE PUMP 3.3µF LATCH LTC1344A
DCE/DTE
(104) (115)
SCTE
DCE/DTE
LTC1544
INVERT
DCE/DTE
Figure Controller-Selectable Port with DB-25 Connector
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(114) SCTE (113) SCTE (103) SGND (102) SHIELD (101)
DB-25 FEMALE CONNECTOR
(106) (107)
(109) (108) (105) (141)
1543
LTC1543
TYPICAL APPLICATIO
DTE_TXD/DCE_RXD DTE_SCTE/DCE_RXC LTC1543 CHARGE PUMP 3.3µF DCE/DTE LATCH
DTE_TXC/DCE_TXC
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DCE/DTE
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
LTC1544
DTE_DCD/DCE_DCD DTE_DSR/DCE_DTR
DTE_CTS/DCE_RTS
DTE_LL/DCE_LL
INVERT
DCE/DTE
DCE/DTE
Figure Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
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100pF 100pF 100pF
LTC1344A
SCTE SCTE
SHIELD
SCTE SCTE
DB-25 CONNECTOR
1543
LTC1543
TYPICAL APPLICATIO
LTC1343 DTE_TXD/DCE_RXD DTE_SCTE/DCE_RXC DTE_RTS/DCE_CTS CHARGE PUMP 3.3µF
DCE/DTE
DTE_LL/DCE_
SCTE SCTE
DTE_TXC/DCE_TXC
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DTE_TM/DCE_LL
100k CTRL LATCH
INVERT 423SET
DTE_DTR/DCE_DSR
LTC1544
DTE_DCD/DCE_DCD DTE_DSR/DCE_DTR
DTE_CTS/DCE_RTS
DTE_RL/DCE_RL
INVERT
DCE/DTE
DCE/DTE
Figure Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
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100pF 100pF 100pF
LTC1344A
LATCH
SHIELD
SCTE SCTE
DB-25 CONNECTOR
1543
LTC1543
TYPICAL APPLICATIO
100pF 100pF 100pF DTE_TXD/DCE_RXD DTE_SCTE/DCE_RXC LTC1543 CHARGE PUMP 3.3µF LATCH LTC1344A
DCE/DTE
SCTE SCTE
SHIELD DB-25 CONNECTOR SCTE SCTE DCE/DTE
DTE_TXC/DCE_TXC
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DCE/DTE
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
LTC1544 CABLE WIRING MODE SELECTION MODE V.35 RS449, V.36 RS232 CABLE WIRING DTE/DCE SELECTION MODE
DTE_DCD/DCE_DCD DTE_DSR/DCE_DTR
DTE_CTS/DCE_RTS
DCE/DTE INVERT
Figure Cable-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
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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.
1543/44
LTC1543
PACKAGE DESCRIPTIO
0.205 0.212** (5.20 5.38)
0.005 0.009 (0.13 0.22)
0.022 0.037 (0.55 0.95)
*DIMENSIONS INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSIONS INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
RELATED PARTS
PART NUMBER
LTC1321 LTC1334 LTC1343 LTC1344A LTC1345 LTC1346A 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 with Termination 3.3V Multiprotocol Transceiver 3.3V Multiprotocol Transceiver 3.3V Multiprotocol Transceiver with Termination
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507
Dimensions inches (millimeters) unless otherwise noted. Package 28-Lead Plastic SSOP (0.209)
(LTC 05-08-1640)
0.397 0.407* (10.07 10.33)
0.301 0.311 (7.65 7.90)
0.068 0.078 (1.73 1.99)
0.0256 (0.65)
0.010 0.015 (0.25 0.38)
0.002 0.008 (0.05 0.21)
SSOP 0694
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 3-Driver/3-Receiver Data Clock Signals 3-Driver/3-Receiver Data Clock Signals 4-Driver/4-Receiver Control Signals Including 5-Driver/5-Receiver Control Signals Including 3-Driver/3-Receiver Data Clock Signals 4-Driver/4-Receiver Control Signals Including 5-Driver/5-Receiver Control Signals Including 3-Driver/3-Receiver Data Clock Signals
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www.linear.com
LINEAR TECHNOLOGY CORPORATION 1998

DESCRIPTIO Software-Selectable Transceiver Supports: RS232, RS449

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