LTC1384
5V Low Power RS232
Transceiver with 2 Receivers
Active in Shutdown
FEATURES
■
■
DESCRIPTIO
■
■
■
■
■
■
Operates from a Single 5V Supply
Low Supply Current: I
CC
= 220µA
I
CC
= 35µA in Shutdown Mode with Both
Receivers Kept Alive
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 LTC
®
1384 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 kept active and I
CC
drops to 35µA. The receiver outputs may be forced into
three-state at any time using the receiver enable (RX EN)
pin.
The LTC1384 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.
APPLICATIO S
■
■
Notebook Computers
Palmtop Computers
TYPICAL APPLICATIO
2
0.1µF
4
5
0.1µF
6
12
V
CC
300k
LOGIC INPUT
LOGIC OUTPUT
11
13
5k
10
18
5k
LTC1384
V
CC
300k
2-Drivers/2-Receivers with Shutdown
and Receiver Enable
17
3
7
0.1µF
QUIESCENT CURRENT (µA)
Quiescent and Shutdown Supply Current
vs Temperature
1200
60
TEST CONDITION: V
CC
= 5V
1000
0.1µF
V
CC
= 5V
800
600
400
200
0
–20
LOGIC INPUT
15
232 OUTPUT
8
14
232 OUTPUT
232 INPUT
0
LOGIC OUTPUT
ON/OFF
9
16
232 INPUT
1
RX EN
LTC1384 • TA01
U
50
SHUTDOWN CURRENT (µA)
U
U
SHUTDOWN
CURRENT
40
30
QUIESCENT
CURRENT
20
10
0
20
40
TEMPERATURE (°C)
60
80
LTC1384 • TA02
1384fa
1
LINER [ LINEAR TECHNOLOGY ]
