LT1039A_01 Datasheet, PDF (1/12 Pages) Linear Technology – Triple RS232 Driver/Receiver with Shutdown

FEATURES
s _{On-Chip ESD Protection:}
±15kV Human Body Model
±15kV IEC-1000-4-2 Air Gap Test**
±8kV IEC-1000-4-2 Contact Test
s _{125kBd Operation with 3kΩ/2500pF Load}
s _{250kBd Operation with 3kΩ/1000pF Load}
s _{Outputs Can Be Driven ±30V Without Damage}
s _{No Supply Current in Shutdown}
s _{Operates from ±5V to ±15V Supplies}
s _{Fully Protected Against Overload}
s _{Three-State Outputs; Outputs Open When Off}
s _{Bipolar Circuit—No Latchup}
s _{±30V Input Range}
s _{Triple Driver/Receiver}
s _{30kΩ Input Impedance}
s _{Meets All RS232 Specifications}
s _{16-Pin Version—Pin Compatible with MC145406}
s _{Available in SO Package}
U
APPLICATIO S
s _{RS232 Interface}
s _Terminals
s _Modems
LT1039A/LT1039A-16
Triple RS232 Driver/Receiver
with Shutdown
DESCRIPTIO
The LT^®1039A is a triple RS232 driver/receiver that
includes shutdown. Each receiver will accept up to ±30V
input and can drive either TTL or CMOS logic. The RS232
drivers accept TTL logic inputs and output RS232 voltage
levels. The outputs are fully protected against overload
and can be shorted to ground or up to ±30V without
damage to the drivers. Additionally, when the system is
shut down or power is off, the outputs are in a high
impedance state allowing data line sharing. On-chip ESD
protection eliminates the need for external protection
devices.
A bias pin allows one receiver to be kept on while the rest
of the part is shut down.
The LT1039A is also available in the 16-pin version,
without shutdown or bias pin functions.
For applications requiring operation from a single 5V
supply, see the LT1180A/LT1181A and LT1130A data
sheets.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
12V
BIAS*
RS232 IN
50Ω**
RS232 OUT
RS232 IN
*BIAS PIN USED
TO KEEP THE
RECEIVER ON
RS232 OUT
WHILE IN SHUTDOWN
**50Ω RESISTORS
MAY BE REQUIRED
FOR IEC-1000-4-2
ESD PROTECTION
RS232 OUT
DEPENDING UPON
PC BOARD AND
CONNECTOR LEAD LENGTH
50Ω**
RS232 IN
50Ω**
– 12V
1
2
V⁺
LT1039A ^VCC
18
17
5V
ON/OFF
3
16
LOGIC
30k
4
5
30k
15 _LOGIC
14 _LOGIC
6
7
30k
13 _LOGIC
12 _LOGIC
8
9 _V–
11 _LOGIC
GND ¹⁰
1039A TA01
Driver Output Swing
V⁺
– 0.4
– 0.8
– 1.2
– 1.6
– 2.0
1.2
0.8
0.4
V^–
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT CURRENT (mA)
1039A TA02
1039afa
1