LT1032C Linear Technology, LT1032C Datasheet - Page 5

• Manufacturer Part Number: LT1032C
• Description: Quad Low Power Line Driver
• Manufacturer: Linear Technology

A
Application Hints
The LT1032 is exceptionally easy to use when compared
to older drivers. Operating supply voltage can be as low as
The logic inputs are internally set at TTL levels. Outputs are
valid for input voltages from 1V above V
the logic inputs to V
ON/OFF control completely turns off all supply current of
the LT1032. The levels required to drive the device on or
off are set by internal emitter-based voltages. Since the
current into the ON/OFF pin is so low, TTL or CMOS drivers
have no problem controlling the device.
The strobe pin is not fully logic compatible. The impedance
of the strobe pin is about 2k to ground. Driving the strobe
pin positive forces the output stages low–even if the device
is shut off. Under worst case conditions, 3V minimum at
2mA are needed driving the strobe pin to insure strobing.
V
(J & N: Pins 2, 5, 9, 12/S: Pins 2, 5, 11, 14): Logic
Input. Operates properly on TTL or CMOS levels. Output
valid form (V
when not used.
(J & N: Pins 3, 6, 8, 11/S: Pins 3, 6, 10, 13): Output. Line
drive output.
ON/OFF (J, N & S: Pin 4): Shuts down entire circuit.
Cannot be left open. For “normally on” operation, connect
to V
PI
TYPICAL
EE
3V or as high as 15V. Input levels are referred to ground.
PPLICATI
U
(J, N & S: Pin 1): Minus Supply. Operates –2V to –15V.
+
.
INPUT
FU
U
C
–
A
TI
+ 2V)
O
1/4 LT1032
PPLICATI
O
U
U
–
S
turns off the output stage. The
S
V
I FOR ATIO
IN
U
15V. Connect to ground
O
V
V
U
+
–
Protecting Against More Than 30V Output Overload
W
S
100 TO
1000
–
to 25V. Driving
LT1032 • TA03a
TO LINE
U
The response pin can be used to make some adjustment
in slew rate. A resistor can be connected between the re-
sponse pin and the power supplies to drive 50 A to 100 A
into the pin. The response pin is a low impedance point
operating at about 0.75V above ground. For supply voltage
up to 6V, current is turned off when the device is turned
off. For higher supply voltages, a Zener should be con-
nected in series with the resistor to limit the voltage applied
to the response pin to 6V. Also, for temperatures above
100 C, using the response pin is not recommended. The
leakage current into the response pin at high temperatures
is excessive.
Outputs are well protected against shorts or externally
applied voltage. Tested limits are 30V, but the device can
withstand external voltages up to breakdown of the tran-
sistors (typically about 50V). The LT1032 is usually immune
to ESD up to 2500V on the outputs with no damage.
GND (J, N & S: Pin 7): Ground. Ground must be more
positive than V
Response Control (J & N: Pin 10/S: Pin 12): Allows
limited change of slew rate. Leave open when not used.
Strobe (J & N: Pin 13/ S: Pin 15): Forces all outputs low.
Drive with 3V.
V
to 15V.
CC
(J & N:Pin 14/S: Pin 15): Positive Supply. Operates 5V
INPUT
1/4 LT1032
–
.
30V ZENERS
LT1032 • TA03b
LT1032
TO LINE
5