lt1181a Linear Technology Corporation, lt1181a Datasheet

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lt1181a

Manufacturer Part Number
lt1181a
Description
Low Power 5v Rs232 Dual Driver/receiver With 0.1?f Capacitors
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
OUTPUTS
ESD Protection over 10kV
Uses Small Capacitors: 0.1 F
120kBaud Operation for R
250kBaud Operation for R
Outputs Withstand 30V Without Damage
CMOS Comparable Low Power: 40mW
Operates from a Single 5V Supply
Rugged Bipolar Design
Outputs Assume a High Impedance State When Off
or Powered Down
Meets All RS232 Specifications
Available With or Without Shutdown
Absolutely No Latch-up
Available in SO Package
Portable Computers
Battery-Powered Systems
Power Supply Generator
Terminals
Modems
INPUTS
LOGIC
LOGIC
ON/OFF
0.1 F
0.1 F
+
+
12
11
13
10
18
2
4
5
6
U
LT1180A
5k
5k
L
L
17
3
7
15
8
14
9
16
= 3k, C
= 3k, C
+
+
U
0.1 F
0.1 F
L
L
= 2500pF
= 1000pF
5V INPUT
V
V
RS232 OUTPUT
RS232 OUTPUT
RS232 INPUT
RS232 INPUT
+
OUT
OUT
LT1180A • TA01
DESCRIPTIO
The LT
pairs with integral charge pump to generate RS232 volt-
age levels from a single 5V supply. These circuits feature
rugged bipolar design to provide operating fault tolerance
and ESD protection unmatched by competing CMOS
designs. Using only 0.1 F external capacitors, these cir-
cuits consume only 40mW of power, and can operate to
120k baud even while driving heavy capacitive loads. New
ESD structures on the chip allow the LT1180A/LT1181A to
survive multiple 10kV strikes, eliminating the need for
costly TransZorbs
LT1181A are fully compliant with EIA RS232 standards.
Driver outputs are protected from overload, and can be
shorted to ground or up to 30V without damage. During
shutdown or power-off conditions, driver and receiver
outputs are in a high impedance state, allowing line
sharing.
The LT1181A is available in 16-pin DIP and SO packages.
The LT1180A is supplied in 18-pin DIP and SO packages
for applications which require shutdown.
TransZorb is a registered trademark of General Instruments, GSI
, LTC and LT are registered trademarks of Linear Technology Corporation.
C
L
RECEIVER
R
C
= 2500pF
OUTPUT
OUTPUT
L
DRIVER
R
= 50pF
INPUT
L
®
= 3k
1180A/LT1181A are dual RS232 driver/receiver
Dual Driver/Receiver with
®
Low Power 5V RS232
U
on the RS232 line pins. The LT1180A/
Output Waveforms
LT1180A/LT1181A
0.1 F Capacitors
LT1180A • TA02
11801afb
1

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lt1181a Summary of contents

Page 1

... The LT1181A is available in 16-pin DIP and SO packages. The LT1180A is supplied in 18-pin DIP and SO packages for applications which require shutdown. , LTC and LT are registered trademarks of Linear Technology Corporation. ...

Page 2

... V ................................................................... 30 sec – V ................................................................... 30 sec Driver Output .............................................. Indefinite – + Receiver Output .......................................... Indefinite to V Operating Temperature Range LT1180AI/LT1181AI .......................... – LT1180AC/LT1181AC ............................. – Storage Temperature Range ................ – 150 C – 30V 30V Lead Temperature (Soldering, 10 sec)................. 300 ORDER PART ...

Page 3

... Note 6: For receiver delay measurements, C set between the receiver’s input logic threshold and the output transition to standard TTL/CMOS logic threshold (t to 0.8V). Note 7: Data rate operation guaranteed by slew rate, short-circuit current and propagation delay tests. LT1180A/LT1181A MIN TYP MAX UNITS – 15 ...

Page 4

... LT1180A/LT1181A W U TYPICAL PERFOR A Driver Maximum Output Voltage vs Load Capacitance 8.0 7.5 7.0 20kBAUD 6.5 60kBAUD 6.0 120kBAUD 5.5 5 LOAD CAPACITANCE (nF) LT1180A • TPC01 Receiver Input Thresholds 3.00 2.75 2.50 2.25 INPUT HIGH 2.00 1.75 1.50 INPUT LOW 1.25 1.00 0.75 0.50 –55 – 100 125 TEMPERATURE (°C) LT1180A • TPC04 ...

Page 5

... Negative Supply Output (RS232 Drivers). V – 2.5V). This pin requires an external charge storage capacitor C 0.1 F. Larger value capacitors may be used to reduce supply ripple. With multiple transceivers, the V – and V pins may be paralleled into common capacitors. LT1180A/LT1181A Slew Rate vs Load Capacitance 8 +SLEW 6 –SLEW 4 ...

Page 6

... The driver outputs are protected against ESD to 10kV for human body model discharges. U ESD PROTECTIO The RS232 line inputs of the LT1180A/LT1181A have on- chip protection from ESD transients up to 10kV. The protection structures act to divert the static discharge safely to system ground. In order for the ESD protection to ...

Page 7

... TTL INPUT 15 RS232 OUTPUT TTL INPUT 14 RS232 INPUT TTL OUTPUT 5k 9 RS232 INPUT TTL OUTPUT 5k TTL OUTPUT – LT1180A/LT1181A ON/OFF CC LT1039 15 4 RS232 OUTPUT 13 6 RS232 OUTPUT 11 8 RS232 OUTPUT 16 3 RS232 INPUT 30k 14 5 RS232 INPUT ...

Page 8

... LT1180A/LT1181A PACKAGE DESCRIPTIO CORNER LEADS OPTION (4 PLCS) 0.045 – 0.068 (1.143 – 1.727) FULL LEAD OPTION 0.300 BSC (0.762 BSC) 0.008 – 0.018 0 – 15 (0.203 – 0.457) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS CORNER LEADS OPTION (4 PLCS) 0.023 – 0.045 (0.584 – ...

Page 9

... MIN 0.125 0.005 0.100 (3.175) (0.127) (2.54) MIN BSC MIN LT1180A/LT1181A MAX 0.065 (1.651) TYP 0.018 0.003 (0.457 0.076) N16 1098 ...

Page 10

... LT1180A/LT1181A PACKAGE DESCRIPTIO 0.291 – 0.299** (7.391 – 7.595) 0.010 – 0.029 (0.254 – 0.737) 0.009 – 0.013 NOTE 1 (0.229 – 0.330) 0.016 – 0.050 (0.406 – 1.270) NOTE: 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. ...

Page 11

... NOTE 0.093 – 0.104 45 (2.362 – 2.642) 0 – 8 TYP 0.050 (1.270) BSC 0.014 – 0.019 (0.356 – 0.482) TYP LT1180A/LT1181A 0.447 – 0.463* (11.354 – 11.760 0.394 – 0.419 (10.007 – 10.643 0.037 – 0.045 (0.940 – ...

Page 12

... ON/OFF COMMENTS Pin Compatible with LT1180A/LT1181A, I Narrow 16-Pin SO Package IEC 1000-4-2 Level 4 Compliance www.linear.com 5V INPUT –12V OUT 0.1 F RS232 OUTPUT RS232 OUTPUT RS232 INPUT RS232 INPUT LT1180A • TA03 = 10mA Max CC LT/CPI 11/01 REV B 1.5K • PRINTED IN USA ...

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