LT1180_1 Datasheet, PDF (1/12 Pages) Linear Integrated Systems – Low Power 5V RS232 Dual Driver/Receiver with 0.1uF Capacitors

FEATURES
s _{ESD Protection over ±10kV}
s _{Uses Small Capacitors: 0.1µF}
s _{120kBaud Operation for RL = 3k, CL = 2500pF}
s _{250kBaud Operation for RL = 3k, CL = 1000pF}
s _{Outputs Withstand ±30V Without Damage}
s _{CMOS Comparable Low Power: 40mW}
s _{Operates from a Single 5V Supply}
s _{Rugged Bipolar Design}
s _{Outputs Assume a High Impedance State When Off}
or Powered Down
s _{Meets All RS232 Specifications}
s _{Available With or Without Shutdown}
s _{Absolutely No Latch-up}
s _{Available in SO Package}
U
APPLICATIO S
s Portable Computers
s _{Battery-Powered Systems}
s _{Power Supply Generator}
s _Terminals
s _Modems
TYPICAL APPLICATIO
+²
0.1µF
4
5
+
0.1µF
6
12
LOGIC
INPUTS
11
13
LOGIC
OUTPUTS
10
18
ON/OFF
LT1180A
17
5V INPUT
3
+
V⁺ OUT
0.1µF
7
V ^– OUT
+ ^0.1µF
15
RS232 OUTPUT
8
14
5k
RS232 OUTPUT
RS232 INPUT
9
5k ₁₆
RS232 INPUT
LT1180A • TA01
LT1180A/LT1181A
Low Power 5V RS232
Dual Driver/Receiver with
0.1µF Capacitors
DESCRIPTIO
The LT^®1180A/LT1181A are dual RS232 driver/receiver
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 0.1µF 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^® on the RS232 line pins. The LT1180A/
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI
DRIVER
OUTPUT
R_L = 3k
C_L = 2500pF
RECEIVER
RCO_L ^U=T5P0UpTF
INPUT
Output Waveforms
LT1180A • TA02
11801afb
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