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LT1237C

5V RS232 Transceiver with Advanced Power Management and One Receiver Active in Shutdown

Linear Technology 

LT1237

U

PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.

SW Package

28-Lead Plastic Small Outline (Wide 0.300)

(LTC DWG # 05-08-1620)

0.291 – 0.299**

(7.391 – 7.595)

0.010

(0.254

–

–

0.029

0.737)

×

45°

0.093

(2.362

–

–

0.104

2.642)

0° – 8° TYP

0.037 – 0.045

(0.940 – 1.143)

0.697 – 0.712*

(17.70 – 18.08)

28 27 26 25 24 23 22 21 20 19 18 17 16 15

0.050

0.009 – 0.013

(0.229 – 0.330) NOTE 1

(1.270)

TYP 0.014 – 0.019

(0.356 – 0.482)

0.016 – 0.050

TYP

NOTE:

(0.406 – 1.270)

1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.

THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

NOTE 1

0.004 – 0.012

(0.102 – 0.305)

0.394 – 0.419

(10.007 – 10.643)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 S28 (WIDE) 0996

TYPICAL APPLICATI

Typical Mouse Driving Application

MOUSE

V+

LOGIC

OPTICS

V–

(1)

(5) (9)

DB9

V+ 1

1.0µF

2 × 0.1µF

5V VCC 2

3

4

DRIVER 1 OUT 5

DCD

RX1 IN 6

DSR

DRIVER 2 OUT 7

RX

RX2 IN 8

RTS

RX3 IN 9

TX

RX4 IN 10

CTS

DRIVER 3 OUT 11

DTR

RX5 IN (LOW-Q) 12

RI

ON/OFF 13

14

LT1237

28 V–

27

0.1µF

26

2 × 0.1µF

25 DRIVER 1 IN

24 RX1 OUT

LOGIC “0”

23 DRIVER 2 IN

22 RX2 OUT

LOGIC “0”

21 RX3 OUT

20 RX4 OUT

MOUSE DATA

19 DRIVER 3 IN

LOGIC “1”

18 RX5 OUT (LOW-Q)

17 GND

16 DRIVER DISABLE

15

1237 TA03

RELATED PARTS

PART NUMBER

LTC®485

LT1137A

LTC1387

LT1780/LT1781

LT1785/LT1791

DESCRIPTION

Low Power RS485 Transceiver

3Dx/5Rx RS232 Transceiver

RS232/RS485 Multiprotocol Transceiver

2Dx/2Rx RS232 Transceiver

60V Fault Tolerant RS485 Transceiver

8

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com

COMMENTS

15kV ESD

15kV ESD

15kV ESD

1237fa LT/TP 0799 2K REV A • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 1992

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