DESCRIPTIO Software-Selectable Transceiver Supports: RS232, RS449

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DESCRIPTIO Software-Selectable Transceiver Supports: RS232, RS449

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LTC1546 Software-Selectable Multiprotocol Transceiver with Termination
DESCRIPTIO
Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 Telecom Services Inc. Certified NET1, NET2 TBR2 Compliant On-Chip Cable Termination Compatible with LTC1543 Complete Port with LTC1544 Operates from Single Supply Small Footprint
APPLICATIO
Data Networking Data Routers
LTC1546 3-driver/3-receiver multiprotocol transceiver with on-chip cable termination. When combined with LTC1544, 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 LTC1546. most applications, LTC1546 replaces both LTC1543 LTC1344A without changes board. LTC1546 runs from single supply using internal charge pump that requires only five space-saving surface mounted capacitors. LTC1546 available 28-lead SSOP surface mount package.
registered trademarks Linear Technology Corporation.
TYPICAL APPLICATIO
Complete Multiprotocol Serial Interface with DB-25 Connector
SCTE
LTC1544
LTC1546
(141)
(106)
(109)
(107)
(108) (105) SHIELD (101)
(102)
(104)
(115)
DB-25 CONNECTOR
1546 TA01
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.
(114) SCTE
SCTE (113)
(103)
LTC1546
ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW DCE/DTE PACKAGE 28-LEAD PLASTIC SSOP D3/R1 D3/R1 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) 0.3V 0.3V Short-Circuit Duration Transmitter Output Indefinite Receiver Output Indefinite Operating Temperature Range LTC1546C 70°C LTC1546I 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1546CG LTC1546IG
TJMAX 150°C, 90°C/ SOLDERED TYPICAL CIRCUIT BOARD TYPICALLY 60°C/W
Consult factory Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL Supplies Supply Current (DCE Mode, Digital Pins VCC) PARAMETER
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. (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 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 V.28 Mode, Load V.28 Mode, Full Load V.35 Mode RS530, RS530-A, X.21 Modes, Full Load
UNITS
Internal Power Dissipation (DCE Mode)
Positive Charge Pump Output Voltage
Negative Charge Pump Output Voltage
LTC1546
ELECTRICAL CHARACTERISTICS
SYMBOL fOSC PARAMETER Charge Pump Oscillator Frequency Charge Pump Rise Time Logic Input High Voltage Logic Input Voltage Logic Input Current VCC, 1.95k (Figure (Figure (Figure (Figure (Figure (Figure VOUT
0.25V, Power No-Cable Mode Driver Disabled
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. (Notes
CONDITIONS No-Cable Mode/Power-Off Normal Operation
UNITS
Logic Inputs Outputs 0.5VODO 0.67VODO ±150
0.45
IOSR IOZR V.11 Driver VODO VODL SKEW V.35 Driver VOA,
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 Input Threshold Voltage Input Hysteresis Input Impedance Rise Fall Time Input Output Rising Input Output Falling Input Output Difference, tPLH tPHL Differential Output Voltage Single-Ended Output Voltage Transmitter Output Offset
±100
(Figures (Figures (Figures (Figures (Figures (Figure 50pF (Figures 50pF (Figures 50pF (Figures 50pF (Figures Open Circuit, 1.95k (Figure With Load, (Figure Open Circuit, 1.95k (Figure (Figure
V.11 Receiver
±1.2 ±0.66 ±1.2 ±0.6
±0.44
±0.55
LTC1546
ELECTRICAL CHARACTERISTICS
SYMBOL SKEW tPLH tPHL V.28 Driver VTHL VTLH tPLH tPHL Output Voltage Short-Circuit Current Power-Off Resistance 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 PARAMETER 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
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. (Notes
CONDITIONS
0.25V
±100
UNITS
(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 (Figure (Figure (Figure 50pF (Figures 50pF (Figures 50pF (Figures
V.35 Receiver ±150 0.05 V/µs
±8.5
V.28 Receiver
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 CVCC CVDD 1µF, CVEE 3.3µF 25°C.
LTC1546
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. Table (Pin 12): Level Mode Select Input with Pull-Up VCC. Table (Pin 13): Level Mode Select Input with Pull-Up VCC. Table DCE/DTE (Pin 14): Level Mode Select Input with PullUp VCC. Table (Pin 15): Receiver Noninverting Input. (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
LTC1546
BLOCK DIAGRA
CHARGE PUMP
51.5 51.5
D3/R1
DCE/DTE
D3/R1
1546
51.5 51.5
51.5 51.5
LTC1546
TEST CIRCUITS
1546
100pF 100pF
1546
Figure V.11 Driver Test Circuit
Figure V.11 Driver Test Circuit
1546
2(VB 1546
Figure Input Impedance Test Circuit
Figure V.11, V.35 Receiver Test Circuit
1546
1546
1546
Figure V.35 Driver Open-Circuit Test
Figure V.35 Driver Test Circuit
Figure V.35 Driver Common Mode Impedance Test Circuit
51.5
1546
51.5
1546
1546
Figure V.35 Driver Test Circuit
Figure V.35 Receiver Test Circuit
Figure Receiver Common Mode Impedance Test Circuit
1546
1546
Figure V.28 Driver Test Circuit
Figure V.28 Receiver Test Circuit
LTC1546
SELECTIO
Table
LTC1546 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
SWITCHI WAVEFOR
SKEW SKEW
1546
1.5V
Figure V.11, V.35 Driver Propagation Delays
VOD2 -VOD2
1.5V
Figure V.11, V.35 Receiver Propagation Delays
1MHz 10ns 10ns 1.5V
1MHz 10ns 10ns INPUT OUTPUT 1.5V
1546
LTC1546
SWITCHI WAVEFOR
1.5V 1.5V
1546
Figure V.28 Driver Propagation Delays
1.3V 1.7V 2.4V 0.8V
1546
Figure V.28 Receiver Propagation Delays
APPLICATIO ATIO
Overview
LTC1546 LTC1544 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 LTC1546 half each port used generate appropriately terminate clock data signals. LTC1544 used generate control signals along with (Local Loopback). 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 VCC. When cable removed, leaving mode pins unconnected, LTC1546/LTC1544 will enter no-cable mode. this mode LTC1546/LTC1544 supply current drops less than 500µA LTC1546/LTC1544 driver outputs forced into high impedance state. same time, receivers LTC1546 differentially terminated with other receivers LTC1546 LTC1544 terminated with ground.
LTC1546
APPLICATIO ATIO
SERIAL CONTROLLER LTC1546
SCTE
LTC1544
Figure Complete Multiprotocol Interface EIA530 Mode
Cable Termination Traditional implementations used expensive relays switch resistors required user change termination modules every time interface standard selected. Switching terminations with FETs difficult because FETs must remain when signal voltage beyond supply voltage. Alternatively, custom cables
LTC1546 SERIAL CONTROLLER SCTE SCTE LTC1544
1546
contain termination cable head route signals various terminations board. LTC1546/LTC1544 chipset 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.
LTC1546
APPLICATIO ATIO
(DATA) LTC1546 DCE/DTE
DCE/DTE LTC1544 (DATA)
1546
Figure Single Port V.35 Mode Selection Cable
BALANCED INTERCONNECTING CABLE
V.10 (RS423) Interface V.10 drivers receivers necessary RS449, EIA530, EIA530-A, V.36 X.21 protocols implemented LTC1544. 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 LTC1544 shown Figure V.10 mode, switch inside LTC1544 turned off. noninverting input disconnected inside LTC1544 receiver connected ground. cable termination then input impedance ground LTC1544 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
GENERATOR
CONNECTOR CABLE
LOAD CABLE TERMINATION RECEIVER
1546
Figure Typical V.10 Interface
3.25mA
-10V
1546
-3.25mA
Figure V.10 Receiver Input Impedance
LTC1546
APPLICATIO ATIO
RECEIVER LTC1544
1546
Figure V.10 Receiver Configuration
BALANCED INTERCONNECTING CABLE
GENERATOR
LOAD CABLE TERMINATION RECEIVER
Figure Typical V.11 Interface
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 LTC1546's receivers which connects differential termination impedance cable shown Figure 231. LTC1544 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
there switch receivers However, simplicity, termination networks LTC1546 treated identically assumed that switch exists always closed receivers.
1Actually,
51.5 51.5 RECEIVER LTC1546
1546
Figure V.11 Receiver Configuration
connected ground connected signal return ground V.28 mode, closed inside LTC1546/LTC1544 which connects (R8) impedance ground parallel with (R5) plus (R6) combined impedance shown Figure Proper termination only provided when input receivers floating, since LTC1546's receivers remains V.28 mode1. noninverting input disconnected inside LTC1546/LTC1544 receiver connected level reference voltage give 1.4V receiver trip point.
GENERATOR BALANCED INTERCONNECTING CABLE LOAD CABLE TERMINATION RECEIVER
1546
1546
Figure Typical V.28 Interface
51.5 51.5 RECEIVER LTC1546
1546
Figure V.28 Receiver Configuration
LTC1546
APPLICATIO ATIO
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. V.35 mode, both switches inside LTC1546 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.
GENERATOR BALANCED INTERCONNECTING CABLE LOAD CABLE TERMINATION RECEIVER
1546
Figure Charge Pump
Figure Typical V.35 Interface
51.5 51.5 RECEIVER LTC1546
Receiver Fail-Safe LTC1546/LTC1544 receivers feature fail-safe operation modes. receiver inputs left floating shorted together termination resistor, receiver output will always forced logic high. Operation DCE/DTE acts enable Driver 3/Receiver LTC1546, Driver 3/Receiver Driver Receiver LTC1544. INVERT LTC1544 allows Driver 4/Receiver enable high true polarity.
1546
Figure V.35 Receiver Configuration
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. Note that LTC1546's receivers continue terminated differential impedance. Charge Pump LTC1546 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 LTC1546 reduce EMI.
LTC1546 3.3µF
1546
LTC1546
APPLICATIO ATIO
LTC1546/LTC1544 configured either operation ways: dedicated port with connector appropriate gender port with connector that configured operation rerouting signals LTC1546/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, that configured either operation shown Figure configuration requires separate cables proper signal routing operation. example, mode, signal routed Pins LTC1546's Driver mode, Driver routes signal Pins Multiprotocol Interface with DB-25 Connector signals implemented, there enough drivers receivers available LTC1546/ LTC1544. Figure required control signals handled LTC1545. LTC1545 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 LTC1546/LTC1544 chipset been tested Telecom Services Inc. passed NET1, NET2 TBR2 requirements. Copies test reports available from Telecom Services. titles reports are: NET1 NET2: Test Report NET2/091301/99. TBR2: Test Report CRT2/091301/99. address Telecom Services Inc. Telecom Services Inc. Type Approval Division 1775 Highway Paul, 55112 TEL: (612) 639-0775 FAX: (612) 639-0873
LTC1546
TYPICAL APPLICATIO
LTC1546 CHARGE PUMP 3.3µF
SCTE
DCE/DTE (114) (115) (104) SHIELD
LTC1544
DCE/DTE INVERT
Figure Controller-Selectable Multiprotocol Port with DB-25 Connector
(103) SCTE (113) SCTE
DB-25 MALE CONNECTOR
(105) (108)
(109) (107) (106) (141)
1546
LTC1546
TYPICAL APPLICATIO
LTC1546 CHARGE PUMP 3.3µF
SCTE DCE/DTE (114) SCTE (113) SCTE (103) SGND (102) SHIELD (101)
LTC1544
DCE/DTE INVERT
Figure Controller-Selectable Port with DB-25 Connector
(104) (115)
DB-25 FEMALE CONNECTOR
(106) (107)
(109) (108) (105) (141)
1546
LTC1546
TYPICAL APPLICATIO
DTE_TXD/DCE_RXD LTC1546 CHARGE PUMP 3.3µF SCTE SCTE
DTE_SCTE/DCE_RXC
SHIELD SCTE SCTE
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
DCE/DTE INVERT
DCE/DTE
Figure Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
DB-25 CONNECTOR
1546
LTC1546
TYPICAL APPLICATIO
DTE_TXD/DCE_RXD DTE_SCTE/DCE_RXC LTC1546 CHARGE PUMP DTE_TXC/DCE_TXC DTE_RXC/DCE_SCTE DTE_RXD/DCE_TXD SHIELD SCTE SCTE 3.3µF SCTE SCTE
DCE/DTE
1,19 2,20
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
LTC1545 DCE/DTE
1546
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
Figure Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
DB-25 CONNECTOR
*OPTIONAL
LTC1546
TYPICAL APPLICATIO
DTE_TXD/DCE_RXD LTC1546 CHARGE PUMP 3.3µF SCTE SCTE
DTE_SCTE/DCE_RXC
SHIELD DB-25 CONNECTOR SCTE SCTE
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
1546
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
DCE/DTE
LTC1546
PACKAGE DESCRIPTIO
5.20 5.38** (0.205 0.212)
0.13 0.22 (0.005 0.009)
0.55 0.95 (0.022 0.037)
NOTE: DIMENSIONS MILLIMETERS *DIMENSIONS INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.152mm (0.006") SIDE **DIMENSIONS INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.254mm (0.010") SIDE
RELATED PARTS
PART NUMBER
LTC1321 LTC1334 LTC1343 LTC1344A LTC1345 LTC1346A LTC1543 LTC1544 LTC1545
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
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408)432-1900 FAX: (408) 434-0507 www.linear-tech.com
Dimensions inches (millimeters) unless otherwise noted. Package 28-Lead Plastic SSOP (0.209)
(LTC 05-08-1640)
10.07 10.33* (0.397 0.407)
7.65 7.90 (0.301 0.311)
1.73 1.99 (0.068 0.078)
0.65 (0.0256)
0.25 0.38 (0.010 0.015)
0.05 0.21 (0.002 0.008)
SSOP 1098
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
1546i LT/TP 1299 PRINTED
LINEAR TECHNOLOGY CORPORATION 1999

DESCRIPTIO Software-Selectable Transceiver Supports: RS232, RS449

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