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PDF LT1032I Data sheet ( Hoja de datos )
| Número de pieza | LT1032I | |
| Descripción | Quad Low Power Line Driver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Low Operating Voltage: ±5V to ±15V
s 500µA Supply Current
s Zero Supply Current when Shut Down
s Outputs Can Be Driven ±30V
s Thermal Limiting
s Output “Open” when Off (Three-State)
s 10mA Output Drive
s Pinout Similar to 1488
U
APPLICATIO S
s RS232
s Power Supply Inverter
s Micropower Interface
s Level Translator
TYPICAL APPLICATIO
RS232 Line Driver
– 6V
INPUT
OUTPUT
ON/OFF
(0V TO 5V)†
INPUT
OUTPUT
GND
1
2
3
4
5
6
7
LT1032
14
6V
13
STROBE*
12
INPUT
11
OUTPUT
10 RESPONSE TIME
9 CONTROL*
INPUT
8
OUTPUT
*NO CONNECTION NEEDED WHEN NOT USED
†5V = ON
LT1032 • TA01
LT1032
Quad Low Power
Line Driver
DESCRIPTIO
The LT®1032 is a RS232 and RS423 line driver that
operates over a ±5V to ±15V range on low supply current
and can be shut down to zero supply current. Outputs are
fully protected from externally applied voltages of ±30V by
both current and thermal limiting. Since the output swings
to within 200mV of the positive supply and 600mV of the
negative supply, power supply needs are minimized.
Also included is a strobe pin to force all outputs low
independent of input or shutdown conditions. Further,
slew rate can be adjusted with a resistor connected to the
supply.
A major advantage of the LT1032 is the high impedance
output state when off or powered down.
For applications requiring dual or triple RS232 driver/
receiver devices, see the LT1180A (dual), LT1039A (triple)
or the LT1130A data sheets.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Output Swing vs Output Current
V+
0.2
VOUT HIGH
0.4
1.0
0.8
0.6
0.4
0.2
V–
0
VOUT LOW
2 4 68
OUTPUT CURRENT (mA)
10
LT1032 • TA02
1
1 page  
LT1032
PI FU CTI S
VEE (J, N & S: Pin 1): Minus Supply. Operates –2V to –15V.
(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 – + 2V) ≤ VIN ≤ 15V. Connect to ground
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 +.
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.
VCC (J & N:Pin 14/S: Pin 15): Positive Supply. Operates 5V
to 15V.
APPLICATI S I FOR ATIO
Application Hints
The LT1032 is exceptionally easy to use when compared
to older drivers. Operating supply voltage can be as low as
±3V or as high as ±15V. Input levels are referred to ground.
The logic inputs are internally set at TTL levels. Outputs are
valid for input voltages from 1V above V – to 25V. Driving
the logic inputs to V – turns off the output stage. The
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 2kΩ 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.
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 50µA to 100µA
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.
TYPICAL APPLICATI S
Protecting Against More Than ±30V Output Overload
V+
INPUT
1/4 LT1032
100Ω TO
1000Ω
TO LINE
INPUT
1/4 LT1032
V–
LT1032 • TA03a
TO LINE
30V ZENERS
LT1032 • TA03b
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LT1032I.PDF ] | |
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