LT1237CNW Linear Technology, LT1237CNW Datasheet

IC TXRX 5V RS232 ADV LOPWR 28DIP

LT1237CNW

Manufacturer Part Number
LT1237CNW
Description
IC TXRX 5V RS232 ADV LOPWR 28DIP
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet

Specifications of LT1237CNW

Number Of Drivers/receivers
3/5
Protocol
RS232
Voltage - Supply
4.5 V ~ 5.5 V
Mounting Type
Through Hole
Package / Case
28-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
LT1237CN
LT1237CN

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1237CNW#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
LINE
1.0 F
TO
2 0.1 F
One Receiver Remains Active While in Shutdown
ESD Protection over 15kV
Uses Small Capacitors: 0.1 F, 0.2 F, 1.0 F
60 A Supply Current in Shutdown
Pin Compatible with LT1137A
120kBaud Operation for R
250kBaud Operation for R
Operates to 120kBaud
CMOS Comparable Low Power 30mW
Operates from a Single 5V Supply
Easy PC Layout—Flowthrough Architecture
Rugged Bipolar Design
Outputs Assume a High Impedance State When Off
or Powered Down
Absolutely No Latchup
Available in SO and SSOP Packages
Notebook Computers
Palmtop Computers
RX5 IN (LOW-Q)
DRIVER 1 OUT
DRIVER 2 OUT
DRIVER 3 OUT
ON/OFF
5V V
RX1 IN
RX2 IN
RX3 IN
RX4 IN
V
CC
+
10
11
12
13
14
1
2
3
4
5
6
7
8
9
U
LT1237
L
L
= 3k, C
= 3k, C
U
28
27
26
25
24
23
22
21
20
19
18
17
16
15
L
L
= 2500pF
= 1000pF
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT (LOW-Q)
GND
DRIVER
DISABLE
V
Advanced Power Management and
2 0.1 F
One Receiver Active in Shutdown
TO LOGIC
RING DETECT IN
SHUTDOWN
CONTROL OUT
CONTROLLER OR
PROCESSOR
DESCRIPTIO
0.1 F
The LT
receiver RS232 transceiver. Included on the chip is a
shutdown pin for reducing supply current near zero.
During shutdown one receiver remains active to detect
incoming RS232 signals, for example, to wake up a
system.
The LT1237 is fully compliant with all EIA RS232 specifi-
cations. New ESD structures on the chip allow the LT1237
to survive multiple 15kV strikes, eliminating the need for
costly TransZorbs
The LT1237 operates in excess of 120kbaud even driving
heavy capacitive loads. Two shutdown modes allow the
driver outputs to be shut down separately from the receiv-
ers for more versatile control of the RS232 interface.
During shutdown, drivers and receivers assume a high
impedance state.
TransZorb is a registered trademark of General Instruments, GSI
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1237 TA01
5V RS232 Transceiver with
®
1237 is an advanced low power three driver, five
R
C
L
RECEIVER
C
= 2500pF
OUTPUT
OUTPUT
L
DRIVER
R
= 50pF
INPUT
L
= 3k
®
U
on the RS232 line pins.
Output Waveforms
LT1237
1237 TA02
1

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LT1237CNW Summary of contents

Page 1

... RS232 interface. During shutdown, drivers and receivers assume a high impedance state. , LTC and LT are registered trademarks of Linear Technology Corporation. TransZorb is a registered trademark of General Instruments, GSI – V ...

Page 2

... C. (Note (Note 3) – ON/OFF 5V DRIVER DISABLE = ORDER PART TOP VIEW NUMBER – – LT1237CG + LT1237CNW 4 25 DR1 IN LT1237CSW 5 24 RX1 OUT 6 DR2 RX2 OUT 8 21 RX3 OUT 9 20 RX4 OUT 10 19 DR3 IN RX5 OUT 11 18 (LOW- GND DRIVER ...

Page 3

ELECTRICAL C HARA TERISTICS C temperature range, otherwise specifications are at T PARAMETER CONDITIONS Any Driver Output Voltage Swing Load = 3k to GND Logic Input Voltage Level Input Low Level (V Input High Level (V Logic Input Current 0.8V ...

Page 4

LT1237 W U TYPICAL PERFOR A Driver Output Voltage OUTPUT HIGH 4. –2 –4 OUTPUT LOW V = 4.5V CC – ...

Page 5

W U TYPICAL PERFOR A Driver Short-Circuit Current –55 – TEMPERATURE ( C) Receiver Output Waveforms RX5 OUTPUT C = 50pF L RX1 TO RX4 OUTPUT C = 50pF L ...

Page 6

LT1237 CTIO S + – + – Commutating Capacitor Inputs, re- quire two external capacitors C 0.2 F: one from C1 – + – and ...

Page 7

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 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 8

... RX3 OUT 8 21 MOUSE DATA RX4 OUT 9 20 DRIVER LOGIC “1” RX5 OUT (LOW-Q) 18 GND 17 DRIVER DISABLE 16 15 1237fa LT/TP 0799 2K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1992 0.394 – 0.419 (10.007 – 10.643) S28 (WIDE) 0996 0.1 F 1237 TA03 ...

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