LTC1385
3.3V Low Power
EIA/TIA-562 Transceiver
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FEATURES
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DESCRIPTIO
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 spacesaving 0.1µF capacitors.
Operates from a Single 3.3V Supply
Low Supply Current: ICC = 200µA
ICC = 35µA in Driver Disable Mode
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
EIA/TIA-562 I/O Lines Can Be Forced to ±25V
Without Damage
Pin Compatible with LT1180A
The transceiver operates in one of three modes: Normal,
Driver Disable or Shutdown. In the Normal mode, ICC 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 ICC drops to 35µA. In the Shutdown mode, everything
is turned off and ICC 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.
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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
and Driver Disable
0.1µF
LTC1385
4
15
VCC
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
0.1µF
300k
12
8
13
14
5k
10
5k
ON/OFF
562 OUTPUT
300k
11
18
9
562 OUTPUT
562 INPUT
562 INPUT
16
0.1µF
400
0.8
QUIESCENT
CURRENT
300
0.6
0.4
200
100
SHUTDOWN
CURRENT
0
–20
0
20
40
TEMPERATURE (°C)
60
0.2
0
80
TEST CONDITION: VCC = 3.3V
1
DRIVER DISABLE
1.0
SHUTDOWN CURRENT (µA)
LOGIC INPUT
6 VCC
1.2
500
7
5
0.1µF
3
600
VCC = 3.3V
QUIESCENT CURRENT (µA)
17
2
Quiescent and Shutdown Supply Current
vs Temperature
LTC1385 • TA02
LTC1385 • TA01
sn1385 1385fas
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