Datasheet

1
LT1039/LT1039-16
1039fd
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
RS232 Driver/Receiver
with Shutdown
The LT
®
1039 is a triple RS232 driver/receiver that in-
cludes 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. Bipolar cir-
cuitry makes this driver/receiver exceptionally rugged
against overloads and immune to latchup.
A BIAS pin allows one receiver to be kept on while the rest
of the part is shut down.
The LT1039 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 LT1080/LT1081, LT1180A/LT1181A and
LT1130A data sheets. For applications requiring 15kV
ESD, see the LT1039A.
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Operates from ±5V to ±15V Supplies
■
Fully Protected Against Overload
■
Outputs Can Be Driven ±30V Without Damage
■
Three-State Outputs; Outputs Open When Off
■
Bipolar Circuit—No Latchup
■
±30V Input Range
■
Triple Driver/Receiver
■
No Supply Current in Shutdown
■
30kΩ Input Impedance
■
Meets All RS232 Specifications
■
16-Pin Version—Pin Compatible with MC145406
■
Available in SO Package
■
15kV ESD: LT1039A
■
RS232 Interface
■
Terminals
■
Modems
Driver Output Swing
30k
LT1039
V
+
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
V
CC
V
–
GND
12V
BIAS*
RS232 IN
ON/OFF
5V
LOGIC
LOGIC
LOGIC
LOGIC
LOGIC
LOGIC
*BIAS PIN USED
TO KEEP THE
RECEIVER ON
WHILE IN SHUTDOWN
RS232 IN
RS232 OUT
RS232 OUT
RS232 OUT
RS232 IN
–12V
1039 TA01
30k
30k
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
–0.5
V
+
8
1039 TA02
0.5
1.0
1.5
V
–
2
4
6
10
NEGATIVE
POSITIVE