LTC1382
5V Low Power
RS232 Transceiver
with Shutdown
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FEATURES
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DESCRIPTIO
The LTC®1382 is an ultra-low power 2-driver/2-receiver
RS232 transceiver that operates from a single 5V
supply. The charge pump requires only four spacesaving 0.1µF capacitors.
Operates from a Single 5V Supply
Low Supply Current: ICC = 220µA
ICC = 0.2µA in Shutdown Mode
ESD Protection Over ±10kV
Uses Small Capacitors: 0.1µF
Operates to 120kBaud
Output Overvoltage Does Not Force Current
Back into Supplies
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
Pin Compatible with LT1180A
The transceiver operates in one of two modes, Normal
and Shutdown. In the Normal mode, ICC is only 220µA
with the driver outputs unloaded. In the Shutdown
mode, the charge pump is turned off, the driver outputs
are forced into three-state, both receivers are off and
ICC drops to 0.2µA.
The LTC1382 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud with a 2500pF, 3kΩ load. Both
driver outputs and receiver inputs can be forced to
±25V without damage and can survive multiple ±10kV
ESD strikes.
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APPLICATIO S
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Notebook Computers
Palmtop Computers
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
2-Drivers/2-Receivers with Shutdown
17
4
3
5
LOGIC INPUT
6
0.1µF
0.1µF
12
15
232 OUTPUT
VCC
300k
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
ON/OFF
11
8
13
14
5k
10
18
9
5k
16
1.2
TEST CONDITION: VCC = 5V
7
VCC
300k
600
232 OUTPUT
232 INPUT
232 INPUT
500
1.0
400
0.8
300
0.6
QUIESCENT
CURRENT
200
0.4
SHUTDOWN
CURRENT
100
0
–20
0
20
40
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
0.1µF
LTC1382
VCC = 5V
QUIESCENT CURRENT (µA)
2
0.1µF
Quiescent and Shutdown Supply Current
vs Temperature
0.2
60
80
0
LTC1382 • TA02
LTC1382 • TA01
1382fa
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