LM139AJ National Semiconductor, LM139AJ Datasheet - Page 7

• Manufacturer Part Number: LM139AJ
• Description: IC COMP HIGH PERF QUAD 14-CDIP
• Manufacturer: National Semiconductor
• Type: General Purposer

Specifications of LM139AJ

• Number Of Elements: 4
• Output Type: CMOS, DTL, ECL, MOS, Open-Collector, TTL
• Voltage - Supply: 2 V ~ 36 V, ±1 V ~ 18 V
• Mounting Type: Through Hole
• Package / Case: 14-CDIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM139AJ

Application Hints
The LM139 series are high gain, wide bandwidth devices
which, like most comparators, can easily oscillate if the
output lead is inadvertently allowed to capacitively couple to
the inputs via stray capacitance. This shows up only during
the output voltage transition intervals as the comparator
changes states. Power supply bypassing is not required to
solve this problem. Standard PC board layout is helpful as it
reduces stray input-output coupling. Reducing this input re-
sistors to
finally, adding even a small amount (1 to 10 mV) of positive
feedback (hysteresis) causes such a rapid transition that
oscillations due to stray feedback are not possible. Simply
socketing the IC and attaching resistors to the pins will cause
input-output oscillations during the small transition intervals
unless hysteresis is used. If the input signal is a pulse
waveform, with relatively fast rise and fall times, hysteresis is
not required.
All pins of any unused comparators should be tied to the
negative supply.
The bias network of the LM139 series establishes a drain
current which is independent of the magnitude of the power
supply voltage over the range of from 2 V
It is usually unnecessary to use a bypass capacitor across
the power supply line.
The differential input voltage may be larger than V
damaging the device. Protection should be provided to pre-
vent the input voltages from going negative more than −0.3
V
in the applications section.
The output of the LM139 series is the uncommitted collector
of a grounded-emitter NPN output transistor. Many collectors
can be tied together to provide an output OR’ing function. An
output pull-up resistor can be connected to any available
power supply voltage within the permitted supply voltage
range and there is no restriction on this voltage due to the
magnitude of the voltage which is applied to the V
of the LM139A package. The output can also be used as a
simple SPST switch to ground (when a pull-up resistor is not
used). The amount of current which the output device can
sink is limited by the drive available (which is independent of
V
is reached (approximately 16 mA), the output transistor will
come out of saturation and the output voltage will rise very
rapidly. The output saturation voltage is limited by the ap-
proximately 60Ω R
voltage of the output transistor (1 mV) allows the output to
clamp essentially to ground level for small load currents.
Typical Applications
DC
+
) and the β of this device. When the maximum current limit
(at 25˚C). An input clamp diode can be used as shown
<
10 kΩ reduces the feedback signal levels and
SAT
Basic Comparator
of the output transistor. The low offset
(V
+
00570603
= 5.0 V
DC
to 30 V
DC
+
+
)
terminal
without
DC
.
7
Driving CMOS
Driving TTL
AND Gate
OR Gate
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