Datasheet

12
LT1780/LT1781
17801f LT/TP 0498 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1998
U
TYPICAL APPLICATIO
Supporting an LT1039 (Triple Driver/Receiver)
30k
30k
RS232 OUTPUT
RS232 OUTPUT
RS232 INPUT
RS232 INPUT
1780/81 • TA04
LT1039
TTL INPUT
30k
RS232 INPUT
V
CC
TTL INPUT
TTL INPUT
TTL OUTPUT
TTL OUTPUT
TTL OUTPUT
ON/OFF
RS232 OUTPUT
5k
RS232 OUTPUT
RS232 INPUT
LT1780
TTL INPUT
5k
RS232 INPUT
V
CC
TTL INPUT
TTL OUTPUT
TTL OUTPUT
ON/OFF
RS232 OUTPUT
1µF
2
4
1µF
5
6
3
7
18 17
1µF 1µF
GND
16
GND
10
V
+
V
1
9
18 17
5V
SHUTDOWN
C2
C2
+
C1
C1
+
V
+
V
11
12
13
10
15
14
9
8
12
14
16
11
13
15
7
5
3
8
6
4
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PART NUMBER DESCRIPTION COMMENTS
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CC
= 220µA
LTC1387 Single 5V RS232/RS485 Multiprotocol Transceiver Configurable as Dual RS232 or Single RS485 Transceiver
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
FAX: (408) 434-0507
www.linear-tech.com