LT1039AISW Linear Technology, LT1039AISW Datasheet - Page 5

• Manufacturer Part Number: LT1039AISW
• Description: Triple RS232 Driver/Receiver with Shutdown
• Manufacturer: Linear Technology

PIN
TYPICAL PERFORMANCE CHARACTERISTICS
V
drops to zero in shutdown mode. Driver outputs are in a
high impedance state when V
BIAS (Pin 2): Keeps receiver 1 on while the LT1309A is in
the shutdown mode. Leave BIAS pin open when not in use.
See Applications Information for proper use.
REC IN (Pins 3, 5, 7): Receiver Input Pins. Accepts RS232
voltage levels ( 30V) and has 0.4V of hysteresis to pro-
vide noise immunity. Input impedance is nominally 30k .
Receiver input pins are internally protected from ESD
transients. In order to insure proper functioning of the ESD
protection devices, the V
bypassed with low ESR capacitors located close to the
pins. A 0.1 F ceramic capacitor works well.
TR OUT (Pins 4, 6, 8): Driver Outputs with RS232 Voltage
Levels. Outputs are in a high impedance state when in the
shutdown mode or when power is off (V
allow data line sharing. Outputs are fully short-circuit
protected from V
in the shutdown mode. Typical output breakdowns are
greater than 45V and higher applied voltages will not
damage the device if moderately current limited. Driver
+
, V
U
–
FUNCTIONS
(Pins 1, 9): Driver Supply Pins. Supply current
RECEIVER
OUTPUT
U
ON/OFF
INPUT
6V
4V
2V
0V
5V
0V
–
+ 30V to V
Shutdown to Receiver Output
V
CC
U
= 5V
CC
(Pin numbers listed are for 18-pin device)
W
and V
+
+
– 30V with power on, off or
and V
2ms/DIV
U
–
supply pins must be
–
= 0V.
+
and V
1039A G11
–
= 0V) to
(THRU 25k )
RECEIVER 1
BIAS INPUT
output pins are internally protected from ESD transients.
In order to insure proper functioning of the ESD protec-
tion devices, the V
bypassed with low ESR capacitors located close to the
pins. 0.1 F ceramic capacitors work well.
GND (Pin 10): Ground Pin.
TR IN (Pins 11, 13, 15): RS232 Driver Input Pins. Inputs
are TTL/CMOS compatible. Inputs should not be allowed
to float. Tie unused inputs to V
REC OUT (Pins 12, 14, 16): Receiver Outputs with TTL/
CMOS Voltage Levels. Outputs are in a high impedance
state when in the shutdown mode to allow data line
sharing. Outputs are fully short-circuit protected to ground
or V
ON/OFF (Pin 17): Controls the operation mode of the
LT1039A and is TTL/CMOS compatible. A logic low puts
the device in the shutdown mode which reduces input
supply current to zero and places both driver and receiver
outputs in a high impedance state.
V
OUTPUT
CC
CC
(Pin 18): 5V Power for Receivers.
with power on, off or in the shutdown mode.
6V
4V
2V
0V
5V
0V
BIAS Pin Response Time
V
CC
= 5V
LT1039A/LT1039A-16
+
0.2 s/DIV
and V
CC
–
.
supply pins must be
1039A G12
5