LTC1385
3.3V Low Power
EIA/TIA-562 Transceiver
FEATURES
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DESCRIPTIO
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Operates from a Single 3.3V Supply
Low Supply Current: I
CC
= 200µA
I
CC
= 35µA in Driver Disable Mode
I
CC
= 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
EIA/TIA-562 I/O Lines Can Be Forced to
±25V
Without Damage
Pin Compatible with LT1180A
The LTC
®
1385 is an ultra-low power, 2-driver/2-receiver
EIA / TIA-562 transceiver which operates from a single
3.3V supply. The charge pump requires only four space-
saving 0.1µF capacitors.
The transceiver operates in one of three modes: Normal,
Driver Disable or Shutdown. In the Normal mode, I
CC
is
only 200µA in the unloaded condition. In the Driver Disable
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. In the Shutdown mode, everything
is turned off and I
CC
drops to 0.2µA.
The LTC1385 is fully compliant with all data rate and
overvoltage EIA / TIA-562 specifications. The transceiver
can operate up to 120kbaud with a 1000pF, 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
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Notebook Computers
Palmtop Computers
TYPICAL APPLICATIO
2-Drivers/2-Receivers with Shutdown
and Driver Disable
2
0.1µF
0.1µF
LOGIC INPUT
4
5
6 V
CC
12
V
CC
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
11
13
10
5k
5k
ON/OFF
18
1
DRIVER DISABLE
LTC1385 • TA01
Quiescent and Shutdown Supply Current
vs Temperature
600
1.2
1.0
SHUTDOWN CURRENT (µA)
17
LTC1385
3
7
300k
15
300k
8
14
9
VCC = 3.3V
500
QUIESCENT CURRENT (µA)
0.1µF
562 OUTPUT
0.1µF
400
300
200
100
0
–20
SHUTDOWN
CURRENT
0
20
40
TEMPERATURE (°C)
60
QUIESCENT
CURRENT
562 OUTPUT
562 INPUT
562 INPUT
16
TEST CONDITION: V
CC
= 3.3V
LTC1385 • TA02
U
0.8
0.6
0.4
0.2
0
80
sn1385 1385fas
U
U
1
LINER [ LINEAR TECHNOLOGY ]
