LTC1349CS

Manufacturer Part NumberLTC1349CS
ManufacturerLinear Technology Corporation
LTC1349CS datasheets

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FEATURE
S
Low Supply Current: 300 A
Two Receivers Kept Alive in SHUTDOWN
ESD Protection Over 10kV
Operates from a Single 5V Supply
Uses Small Capacitors: 0.1 F
Operates to 120k Baud
Three-State Outputs Are High Impedance When Off
Output Overvoltage Does Not Force Current
Back into Supplies
RS232 I/O Lines Can Be Forced to 25V
Without Damage
Pin Compatible with LT1137A and LT1237
Flowthrough Architecture
U
O
A
PPLICATI
S
Notebook Computers
Palmtop Computers
O
U
TYPICAL
A
PPLICATI
3-Drivers/5-Receivers with SHUTDOWN
+
1
V
LTC1349
C1
2
0.1 F
V
CC
3
C2
4
0.1 F
5
DRIVER 1 OUT
6
RX1 IN
7
DRIVER 2 OUT
8
RX2 IN
9
RX3 IN
10
RX4 IN
11
DRIVER 3 OUT
12
RX5 IN
13
ON/OFF
14
NC
3-Driver/5-Receiver Transceiver
with 2 Receivers Active
D
ESCRIPTIO
The LTC1349 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. In the no load condition, the
supply current is only 300 A. The charge pump only
requires four 0.1 F capacitors.
In SHUTDOWN mode, two receivers are kept alive and the
supply current is 35 A. All RS232 outputs assume a high
impedance state in SHUTDOWN and with the power off.
The LTC1349 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud with a 2500pF, 3k load. Both
driver outputs and receiver inputs can be forced to 25V
without damage, and can survive multiple 10kV ESD
strikes.
Quiescent and SHUTDOWN Supply Current
–
V
28
1200
C4
27
0.1 F
C3
26
0.1 F
1000
25
DRIVER 1 IN
24
800
RX1 OUT
23
DRIVER 2 IN
600
22
RX2 OUT
21
RX3 OUT
400
20
RX4 OUT
19
DRIVER 3 IN
200
18
RX5 OUT
17
GND
16
NC
15
NC
LTC1349 • TA01
LTC1349
5V Low Power RS232
in SHUTDOWN
U
vs Temperature
60
50
SHUTDOWN
40
CURRENT
30
QUIESCENT
20
CURRENT
10
0
0
–40
–20
0
20
40
60
80
100
TEMPERATURE (°C)
TEST CONDITION:
V
= 5V, ALL DRIVER INPUTS TIED TO V
.
CC
CC
LTC1349 • TA02
1

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LTC1349CS Summary of contents

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