LTC1337 Datasheet, PDF (1/8 Pages) Linear Technology – 5V Low Power RS232 3-Driver/5-Receiver Transceiver

LTC1337
5V Low Power RS232
3-Driver/5-Receiver Transceiver
FEATURES
s _{Low Supply Current: 300µA}
s _{1µA Supply Current in SHUTDOWN}
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 _{Pin Compatible with LT1137A and LT1237}
s _{Flowthrough Architecture}
APPLICATI S
s _{Notebook Computers}
s _{Palmtop Computers}
DESCRIPTIO
The LTC1337 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. In the no load condition, the
supply current is only 300µA. The charge pump only
requires four 0.1µF capacitors and can supply up to 12mA
of extra current to power external circuitry.
In SHUTDOWN mode, the supply current is further re-
duced to 1µA. All RS232 outputs assume a high imped-
ance state in SHUTDOWN and with the power off.
The LTC1337 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud 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.
TYPICAL APPLICATI
3-Drivers/5-Receivers with SHUTDOWN
C1
0.1µF
V⁺ 1
V_CC ²
3
C2
0.1µF
4
DRIVER 1 OUT ⁵
RX1 IN ⁶
DRIVER 2 OUT ⁷
RX2 IN ⁸
RX3 IN ⁹
10
RX4 IN
11
DRIVER 3 OUT
12
RX5 IN
13
ON/OFF
14
LTC1337
28 V^–
27
26
C3
0.1µF
25
DRIVER 1 IN
24
RX1 OUT
23
DRIVER 2 IN
22
RX2 OUT
21
RX3 OUT
20
RX4 OUT
19
DRIVER 3 IN
18
RX5 OUT
17
GND
16
15
C4
0.1µF
1337 TA01
Supply Current
600
1.2
500
1.0
400
0.8
QUIESCENT
CURRENT
300
0.6
200
0.4
SHUTDOWN
CURRENT
100
0.2
0
– 20
0 20 40 60
TEMPERATURE (°C)
TEST CONDITION:
V_CC = 5V, ALL DRIVER INPUTS TIED TO V_CC
0
80
1337 TA02
1