LTC1382_15 Datasheet, PDF (1/8 Pages) Linear Technology – 5V Low Power RS232 Transceiver with Shutdown

FEATURES
■ _{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}
U
APPLICATIO S
■ _{Notebook Computers}
■ _{Palmtop Computers}
TYPICAL APPLICATIO
LTC1382
5V Low Power
RS232 Transceiver
with Shutdown
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 space-
saving 0.1µF capacitors.
The transceiver operates in one of two modes, Normal
and Shutdown. In the Normal mode, I_CC 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
I_CC 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
2-Drivers/2-Receivers with Shutdown
0.1µF
0.1µF
LOGIC INPUT
LOGIC INPUT
LOGIC OUTPUT
2
4
5
LTC1382
6 _VCC
300k
12
V_CC
300k
11
13
5k
17 _{VCC = 5V}
3
7
0.1µF
0.1µF
15 _{232 OUTPUT}
8
232 OUTPUT
14
232 INPUT
10
LOGIC OUTPUT
18
ON/OFF
9
232 INPUT
5k
16
LTC1382 • TA01
Quiescent and Shutdown Supply Current
vs Temperature
600
1.2
TEST CONDITION: V_CC = 5V
500
1.0
400
0.8
300
QUIESCENT
0.6
CURRENT
200
0.4
SHUTDOWN
CURRENT
100
0.2
0
–20
0
0
20
40
60
80
TEMPERATURE (°C)
LTC1382 • TA02
1382fa
1