LTC1543C Linear Technology, LTC1543C Datasheet

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LTC1543C

Manufacturer Part Number
LTC1543C
Description
Software-Selectable Multiprotocol Transceiver
Manufacturer
Linear Technology
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
TUV/Detecon Inc. Certified NET1 and NET2
Compliant (Test Report No. NET2/102201/97)
TBR2 Compliant (Test Report No. CTR2/022701/98)
Software-Selectable Cable Termination Using
the LTC1344A
Complete DTE or DCE Port with LTC1544, LTC1344A
Operates from Single 5V Supply
Data Networking
CSU and DSU
Data Routers
D4
R4
LL
18
CTS
13
R3
5
U
DSR
10
R2
8
R1
LTC1544
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
DCD
D3
22
U
6
DTR
D2
23
20
RTS
19
D1
DB-25 CONNECTOR
4
1
7
RXD
16
R3
3
DESCRIPTIO
The LTC
ceiver that operates from a single 5V supply. The LTC1543
and LTC1544 form the core of a complete software-select-
able DTE or DCE interface port that supports the RS232,
RS449, EIA530, EIA530-A, V.35, V.36 or X.21 protocols.
Cable termination may be implemented using the LTC1344A
software-selectable cable termination chip or by using exist-
ing discrete designs.
The LTC1543 runs from a single 5V supply using an internal
charge pump that requires only five space-saving surface
mounted capacitors. The part is available in a 28-lead SSOP
surface mount package.
RXC
R2
9
, LTC and LT are registered trademarks of Linear Technology Corporation.
Multiprotocol Transceiver
17
R1
®
LTC1543
1543 is a 3-driver/3-receiver multiprotocol trans-
Software-Selectable
TXC
12
D3
15
SCTE
U
D2
11
24
TXD
14
D1
2
1543 TA01
LTC1543
LTC1344A
1

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LTC1543C Summary of contents

Page 1

... The LTC1543 runs from a single 5V supply using an internal charge pump that requires only five space-saving surface mounted capacitors. The part is available in a 28-lead SSOP surface mount package. , LTC and LT are registered trademarks of Linear Technology Corporation. DTR RTS RXD RXC ...

Page 2

... V ....................................................... – 0.3V to 10V DD Short-Circuit Duration Transmitter Output ..................................... Indefinite Receiver Output .......................................... Indefinite V .................................................................. 30 sec EE Operating Temperature Range LTC1543C .............................................. LTC1543I ........................................... – Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Supplies I V Supply Current (DCE Mode, ...

Page 3

... OD I Transmitter Output High Current OH I Transmitter Output Low Current OL I Transmitter Output Leakage Current (Notes CONDITIONS D1, D2, D3 M0, M1, M2, DCE = GND (LTC1543C) M0, M1, M2, DCE = GND (LTC1543I) M0, M1, M2, DCE = – 4mA 4mA ...

Page 4

... V )/2 2V (Figure – 10V V 10V A,B – 10V V 10V A,B (Figures 3, 7) (Figures 3, 7) (LTC1543C) (Figures 3, 7) (LTC1543I) (Figures 3, 7) (LTC1543C) (Figures 3, 7) (LTC1543I) – t (Figures 3, 7) (LTC1543C) PHL (Figures 3, 7) (LTC1543I) Open Circuit (Figure GND OUT – 0.25V V ...

Page 5

PIN FUNCTIONS – C1 (Pin 1): Capacitor C1 Negative Terminal. Connect capacitor between C1 and (Pin 2): Capacitor C1 Positive Terminal. Connect capacitor between C1 and ...

Page 6

LTC1543 TEST CIRCUITS Figure 4. V.10/V.28 Driver Test Circuit W U ODE SELECTIO LTC1543 MODE NAME M2 Not Used (Default V.11) 0 RS530A 0 RS530 0 X.21 0 V.35 1 RS449/V.36 1 V.28/RS232 ...

Page 7

U W SWITCHI WAVEFOR 1. PLH – A 50% – OD2 0V B – A –V OD2 t PLH V ...

Page 8

LTC1543 U U APPLICATIONS INFORMATION Overview The LTC1543/LTC1544 form the core of a complete soft- ware-selectable DTE or DCE interface port that supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36 or X.21 protocols. Cable termination may be implemented using the ...

Page 9

U U APPLICATIONS INFORMATION DTE SERIAL LTC1543 CONTROLLER D1 TXD D2 SCTE D3 R1 TXC RXC R2 RXD R3 LTC1544 D1 RTS DTR D2 D3 DCD R1 DSR R2 R3 CTS Figure 10. Complete Multiprotocol Interface in ...

Page 10

LTC1543 U U APPLICATIONS INFORMATION (DATA LTC1543 DCE/DTE LTC1544 14 DCE/DTE (DATA) Figure 11: Single Port DCE V.35 Mode Selection in the Cable ...

Page 11

U U APPLICATIONS INFORMATION I Z –10V –3V 3V –3.25mA Figure 13. V.10 Receiver Input Impedance V.11 (RS422) Interface A typical V.11 balanced interface is shown in Figure 15. A V.11 differential generator with outputs A and B with ground ...

Page 12

LTC1543 U U APPLICATIONS INFORMATION V.28 (RS232) Interface A typical V.28 unbalanced interface is shown in Figure 17. A V.28 single-ended generator output A with ground C is connected to a single-ended receiver with input A ' nected to A, ...

Page 13

U U APPLICATIONS INFORMATION impedance of the receiver is placed in parallel with the T network termination, but does not affect the overall input impedance significantly. The generator differential impedance must be 50 150 and the impedance between shorted terminals ...

Page 14

LTC1543 U U APPLICATIONS INFORMATION DTE vs DCE Operation The DCE/DTE pin acts as an enable for Driver 3/Receiver 1 in the LTC1543, and Driver 3/Receiver 1 and Driver 4/ Receiver 4 in the LTC1544. The INVERT pin in the ...

Page 15

U TYPICAL APPLICATIONS CHARGE PUMP LTC1543 5 TXD D1 6 SCTE TXC 9 R2 RXC 10 RXD R3 11 ...

Page 16

LTC1543 U TYPICAL APPLICATIONS CHARGE PUMP LTC1543 5 RXD D1 6 RXC TXC 9 SCTE 10 TXD ...

Page 17

U TYPICAL APPLICATIONS DTE_TXD/DCE_RXD 6 DTE_SCTE/DCE_RXC 7 8 DTE_TXC/DCE_TXC 9 DTE_RXC/DCE_SCTE 10 DTE_RXD/DCE_TXD DCE/DTE V CC ...

Page 18

LTC1543 U TYPICAL APPLICATIONS DTE_LL/DCE_TM 6 DTE_TXD/DCE_RXD 7 DTE_SCTE/DCE_RXC DTE_TXC/DCE_TXC 14 DTE_RXC/DCE_SCTE 15 DTE_RXD/DCE_TXD 16 DTE_TM/DCE_LL 20 CTRL ...

Page 19

... Figure 27. Cable-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 20

... Data and Clock Signals Companion to LTC1543 for Control Signals 0.397 – 0.407* (10.07 – 10.33 0.301 – 0.311 (7.65 – 7.90 0.068 – 0.078 (1.73 – 1.99) 0.002 – 0.008 (0.05 – 0.21) G28 SSOP 0694 1543fs, sn1543x LT/TP 0898 4K • PRINTED IN LINEAR TECHNOLOGY CORPORATION 1998 USA ...

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