LTC1384 Datasheet, PDF (1/8 Pages) Linear Technology – 5V Low Power RS232 Transceiver with 2 Receivers Active in Shutdown

FEATURES
s _{Operates from a Single 5V Supply}
s _{Low Supply Current: ICC = 220µA}
s _{ICC = 35µA in Shutdown Mode with Both}
Receivers Kept Alive
s _{ESD Protection Over ±10kV}
s _{Uses Small Capacitors: 0.1µF}
s _{Operates to 120kBaud}
s _{Output Overvoltage Does Not Force Current}
Back into Supplies
s _{RS232 I/O Lines Can Be Forced to ±25V}
Without Damage
s _{Pin Compatible with LT1180A}
APPLICATI S
s _{Notebook Computers}
s _{Palmtop Computers}
LTC1384
5V Low Power RS232
Transceiver with 2 Receivers
Active in Shutdown
DESCRIPTIO
The LTC1384 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 (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.
TYPICAL APPLICATI
2-Drivers/2-Receivers with Shutdown
and Receiver Enable
0.1µF
0.1µF
LOGIC INPUT
LOGIC INPUT
LOGIC OUTPUT
2
4
5
LTC1384
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
1
RX EN
LTC1384 • TA01
Quiescent and Shutdown Supply Current
vs Temperature
1200
60
TEST CONDITION: V_CC = 5V
1000
50
800
SHUTDOWN
CURRENT
40
600
30
400
QUIESCENT
20
CURRENT
200
10
0
–20
0
0
20
40
60
80
TEMPERATURE (°C)
LTC1384 • TA02
1