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LTC1385CS Datasheet

  • LTC1385CS

  • 3.3V Low Power EIA/TIA-562 Transceiver

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LTC1385
3.3V Low Power
EIA/TIA-562 Transceiver
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
Operates from a Single 3.3V Supply
Low Supply Current: I
CC
= 200碌A(chǔ)
I
CC
= 35碌A(chǔ) in Driver Disable Mode
I
CC
= 0.2碌A(chǔ) in Shutdown Mode
ESD Protection Over
鹵10kV
Uses Small Capacitors: 0.1碌F
Operates to 120kBaud
Output Overvoltage Does Not Force Current
Back into Supplies
EIA/TIA-562 I/O Lines Can Be Forced to
鹵25V
Without Damage
Pin Compatible with LT1180A
The LTC1385 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 0.1碌F capacitors.
The transceiver operates in one of three modes: Normal,
Driver Disable or Shutdown. In the Normal mode, I
CC
is
only 200碌A(chǔ) 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 35碌A(chǔ). In the Shutdown mode, everything
is turned off and I
CC
drops to 0.2碌A(chǔ).
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, 3k鈩?load.
Both driver outputs and receiver inputs can be forced to
鹵25V
without damage, and can survive multiple
鹵10kV
ESD strikes.
APPLICATI
s
s
S
Notebook Computers
Palmtop Computers
TYPICAL APPLICATI
2-Drivers/2-Receivers with Shutdown
and Driver Disable
2
0.1碌F
0.1碌F
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 鈥?TA01
Quiescent and Shutdown Supply Current
vs Temperature
600
1.2
1.0
SHUTDOWN CURRENT (碌A(chǔ))
17
LTC1385
3
7
300k
15
300k
8
14
9
VCC = 3.3V
500
0.1碌F
562 OUTPUT
0.1碌F
QUIESCENT CURRENT (碌A(chǔ))
400
300
200
100
0
鈥?0
SHUTDOWN
CURRENT
0
20
40
TEMPERATURE (擄C)
60
QUIESCENT
CURRENT
562 OUTPUT
562 INPUT
562 INPUT
16
TEST CONDITION: V
CC
= 3.3V
LTC1385 鈥?TA02
U
0.8
0.6
0.4
0.2
0
80
UO
UO
1

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