LTC1350 Datasheet, PDF (1/8 Pages) Linear Technology – 3.3V Low Power EIA/TIA-562 3-Driver/ 5-Receiver Transceiver

LTC1350
3.3V Low Power
EIA/TIA-562 3-Driver/
5-Receiver Transceiver
FEATURES
s _{Low Supply Current}
300µA
s _{Receivers 4 and 5 Kept Alive}
in SHUTDOWN
35µA
s _{ESD Protection}
±10kV
s _{Operates from a Single 3.3V 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 _{EIA/TIA-562 I/O Lines Can Be Forced to ±25V}
Without Damage
s _{Flowthrough Architecture}
APPLICATI S
s _{Notebook Computers}
s _{Palmtop Computers}
DESCRIPTIO
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 300µA. The charge pump
only requires four 0.1µF capacitors.
In SHUTDOWN mode, two receivers are kept alive and
the supply current is only 35µA. 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 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
V^{+ 1}
2
V_CC
C1^{+ 3}
C1^{– 4}
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
LTC1350
28 _{V –}
27 _C2+
26 _C2–
25
DR1 IN
24
RX1 OUT
23
DR2 IN
22
RX2 OUT
21
RX3 OUT
20
RX4 OUT
19
DR3 IN
18
RX5 OUT
17
GND
16
NC
15
NC
LTC1350 • TA01
Quiescent and Shutdown Supply Current vs Temperature
600
85
TEST CONDITION: V_CC = 3.3V
ALL DRIVER INPUTS TIED TO V_CC
500
75
400
65
QUIESCENT
CURRENT
300
55
200
45
SHUTDOWN CURRENT
100
35
0
–40 –20
0 20 40 60
TEMPERATURE (˚C)
0
80 100
LTC1350 • TA02
1