LTC1338 Datasheet, PDF (1/8 Pages) Linear Technology – 5V Low Power RS232 5-Driver/3-Receiver Transceiver

LTC1338
5V Low Power RS232
5-Driver/3-Receiver Transceiver
FEATURES
s _{Low Supply Current: 500µA}
s _{0.2µA Supply Current in SHUTDOWN}
s _{50µA Supply Current in RECEIVER ALIVE Mode}
s _{ESD Protection Over ±10kV}
s _{Operates from a Single 5V Supply}
s _{Uses Small Capacitors: 0.1µF}
s _{Operates to 120k Baud}
s _{Three-State Outputs Are High Impedance When Off}
s _{Output Overvoltage Does Not Force Current}
Back into Supplies
s _{RS232 I/O Lines Can Be Forced to ±25V}
Without Damage
s _{Flowthrough Architecture}
APPLICATI S
s _{Battery-Powered Modems}
s _{Battery-Powered DCE}
s _{Notebook Computers}
s _{Palmtop Computers}
DESCRIPTIO
The LTC1338 is a 5-driver/ 3-receiver RS232 trans-
ceiver with very low supply current. In the no load
condition, the supply current is only 500µA. The charge
pump only requires four 0.1µF capacitors.
In SHUTDOWN mode, the supply current is further
reduced to 0.2µA. In RECEIVER ALIVE mode, all three
receivers are kept alive and the supply current is 50µA.
All RS232 outputs assume a high impedance state in
SHUTDOWN and with the power off.
The LTC1338 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud with a 2500pF, 3kΩ load. Both
driver outputs and receiver inputs can be forced to
±25V without damage, and can survive multiple ±10kV
ESD strikes.
TYPICAL APPLICATI
C1
0.1µF
5-Drivers/3-Receivers with SHUTDOWN
V⁺ 1
V_CC ²
3
C2
0.1µF
4
DRIVER 1 OUT ⁵
DRIVER 2 OUT ⁶
RX1 IN ⁷
DRIVER 3 OUT ⁸
RX2 IN ⁹
10
DRIVER 4 OUT
11
RX3 IN
12
DRIVER 5 OUT
13
RX ENABLE
14
NC
LTC1338
28 V^–
27
26
C3
0.1µF
25
DRIVER 1 IN
24
DRIVER 2 IN
23
RX1 OUT
22
DRIVER 3 IN
21
RX2 OUT
20
DRIVER 4 IN
19
RX3 OUT
18
DRIVER 5 IN
17
GND
16
DRIVER ENABLE
15
NC
C4
0.1µF
LTC1338 • TA01
Supply Current
1200
1.2
1000
1.0
800
0.8
600
QUIESCENT
0.6
CURRENT
400
0.4
SHUTDOWN
CURRENT
200
0.2
0
–40 –20 0 20 40 60 80
TEMPERATURE (°C)
TEST CONDITION:
V_CC = 5V, ALL DRIVER INPUTS TIED TO V_CC.
0
100
LTC1338 • TA02
1