LT1332CSW Linear Technology, LT1332CSW Datasheet

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LT1332CSW

Manufacturer Part Number
LT1332CSW
Description
IC TXRX RS232 W/12V VPP 24-SOIC
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet

Specifications of LT1332CSW

Number Of Drivers/receivers
3/5
Protocol
RS232
Voltage - Supply
2 V ~ 6 V
Mounting Type
Surface Mount
Package / Case
24-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1332CSW
Manufacturer:
LINEAR/凌特
Quantity:
20 000
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FEATURES
APPLICATIONS
TYPICAL APPLICATION
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n
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n
n
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n
n
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**
BATTERIES
*
SWITCHER
STANDARD FLASH MEMORY VPP GENERATOR
UP TO 6V
AVX TAJE226K035
SUMIDA CD54-330N (708-956-0666)
V
Notebook and Palmtop Computers
Mouse Driver Circuits
Contact Linear Technology for Potential Replacement
LT1332 Powered from an LT1109A Micropower Switching Regulator
Generates Full RS232 Signal Levels from 3V Supply
12V VPP Output Available for Flash Memory
Useful with a Wide Variety of Switching Regulators
Low Supply Current: I(V
Wide Supply Range: 2V ≤ V
ESD Protection Over ±10kV
Operates to 120k Baud
Outputs Assume a High Impedance State When Off
or Powered Down
One µPower Receiver Remains Active While in
SHUTDOWN
Flowthrough Architecture Eases PC Board Layout
40µA Supply Current in SHUTDOWN
Absolutely No Latch-Up
Available in SO and SSOP Packages
IN
2 AA
FOR INFORMATION PURPOSES ONLY
ON/OFF
22µF*
OBSOLETE:
SW
ON/OFF
GND
V
IN
LT1109A-12
Configured for Flash Memory
33µH
L1**
SENSE
PGND
SW
CC
MBRS130T3
) = 1mA
CC
≤ 6V
12V VPP
OUTPUT
RS232
V
3V
CC
22µF*
+
RS232
0.1µF
SIDE
NC
1µF
V
C
+
10
11
12
Low Power RS232 Transceiver with
12V VPP Output for Flash Memory
1
2
3
4
5
6
7
8
9
LT1332
LT1332 • TA01
DESCRIPTION
The LT1332 is a 3-driver/5-receiver RS232 transceiver,
designed to be used in conjunction with a switching
regulator. The LT1332 shares the regulator’s positive
output, while charge is capacitively pumped from the
regulator’s switch pin to the negative supply. Schottky
rectifiers built into the LT1332 simplify the charge
pump design.
The LT1332/LT1109A combination shown below generates
fully compliant RS232 signal levels from as little as 2V of
input supply. The switcher can deliver greater than 100mA
of output current, making the LT1332 an excellent choice
for mouse driver circuits.
Advanced driver output stages operate up to 120k baud
while driving heavy capacitive loads. New ESD structures
on chip make the LT1332 resilient to multiple ±10kV strikes,
eliminating costly transient suppressors.
A shutdown pin disables the transceiver except for one
receiver which remains active for detecting incoming
RS232 signals. When shut down, the disabled drivers and
receivers assume high impedance output states.
24
23
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19
18
17
16
15
14
13
RS232
ON/OFF
V
LOGIC
SIDE
+
10µF
C
L
Wide Supply Range
RECEIVER
C
= 2500pF
L
OUTPUT
OUTPUT
DRIVER
DRIVER
R
= 50pF
INPUT
L
= 3k
Output Waveforms
LT1332
LT1332 • TA02
1

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LT1332CSW Summary of contents

Page 1

... OBSOLETE: FOR INFORMATION PURPOSES ONLY Contact Linear Technology for Potential Replacement FEATURES Generates Full RS232 Signal Levels from 3V Supply n 12V VPP Output Available for Flash Memory n Useful with a Wide Variety of Switching Regulators n Low Supply Current: I 1mA n CC Wide Supply Range: 2V ≤ V ≤ ...

Page 2

LT1332 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage (V ) .................................................. .........................................................................13.2V – V ...................................................................... – 13.2V – C ........................................................................... –15V Input Voltage Driver ........................................................... V Receiver ................................................. 30V to –30V Output Voltage Driver ..................................................... 30V to ...

Page 3

ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS Power Supply ON/OFF Pin Thresholds Input Low Level (Device Shut Down) Input High Level (Device Enabled) ON/OFF Pin Current 0V ≤ V Drivers Output Voltage Swing GND L Logic Input Voltage Level ...

Page 4

LT1332 TYPICAL PERFORMANCE CHARACTERISTICS Unloaded Supply Current vs Temperature 1.6 1.4 1.2 – I(V ) DRIVER OUTPUTS HIGH 1.0 I 0.8 + I(V ) 0.6 DRIVER OUTPUTS LOW 0.4 0.2 0 –50 – 100 ...

Page 5

... For some low frequency Burst Mode ™ regulators, the filter capacitor should be relatively large (C ≥ 10µF). Low ESR tantalum capacitors Burst Mode ™ trademark of Linear Technology Corporation LT1332 Receiver Output Voltage vs Supply Voltage 0.6 RECEIVER 0.5 OUTPUT LOW SINKING 500µ ...

Page 6

LT1332 PIN FUNCTIONS work well in this application. When V an external supply, the filter capacitor can be considerably smaller (C ≥ 0.1µF). Ceramic capacitors work well under – these conditions. V should be greater than –13.2V and less than ...

Page 7

... Figure 1. Multiple LT1332s Powered from a Single LT1172 DC/DC Converter 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 8

... MAX 0.598 – 0.614 (15.190 – 15.600) (NOTE (10.007 – 10.643 0211 REV B • PRINTED IN USA  LINEAR TECHNOLOGY CORPORA TION 1993 0.394 – 0.419 ...

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