LTC1350
3.3V Low Power
EIA/TIA-562 3-Driver/
5-Receiver Transceiver
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
Low Supply Current
300碌A
Receivers 4 and 5 Kept Alive
in SHUTDOWN
35碌A
ESD Protection
卤10kV
Operates from a Single 3.3V Supply
Uses Small Capacitors
0.1碌F
Operates to 120k Baud
Three-State Outputs are High Impedance
When Off
Output Overvoltage Does Not Force Current
Back into Supplies
EIA/TIA-562 I/O Lines Can Be Forced to
卤25V
Without Damage
Flowthrough Architecture
The LTC1350 is a 3-driver/5-receiver EIA/TIA-562 trans-
ceiver with very low supply current. In the no load condi-
tion, the supply current is only 300碌A. The charge pump
only requires four 0.1碌F capacitors.
In SHUTDOWN mode, two receivers are kept alive and
the supply current is only 35碌A. All RS232 outputs
assume a high impedance state in SHUTDOWN or with
the power off.
The LTC1350 is fully compliant with all data rate and
overvoltage EIA/TIA-562 specifications. The transceiver
can operate up to 120k baud with a 1000pF and 3k鈩?/div>
load. Both driver outputs and receiver inputs can be
forced to
卤25V
without damage and can survive multiple
卤10kV
ESD strikes.
APPLICATI
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s
S
Notebook Computers
Palmtop Computers
TYPICAL APPLICATI
V
+
V
CC
1
2
LTC1350
3-Drivers/5-Receivers with Shutdown
28
27
26
25
24
23
22
21
20
19
18
17
16
15
LTC1350 鈥?TA01
Quiescent and Shutdown Supply Current vs Temperature
600
500
QUIESCENT CURRENT (碌A)
V
鈥?/div>
C2
+
C2
鈥?/div>
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
GND
NC
NC
TEST CONDITION: V
CC
= 3.3V
ALL DRIVER INPUTS TIED TO V
CC
3
C1
+
4
C1
鈥?/div>
5
DR1 OUT
6
RX1 IN
7
DR2 OUT
8
RX2 IN
9
RX3 IN
10
RX4 IN
11
DR3 OUT
12
RX5 IN
13
ON/OFF
14
NC
400
300
200
100
0
鈥?0 鈥?0
U
85
75
65
55
45
SHUTDOWN CURRENT
35
0
100
SHUTDOWN CURRENT (碌A)
UO
UO
QUIESCENT
CURRENT
40
20
60
0
TEMPERATURE (藲C)
80
LTC1350 鈥?TA02
1
1
2
3
4
5
6
7
8
