LM2903M National Semiconductor, LM2903M Datasheet - Page 8

• Manufacturer Part Number: LM2903M
• Description: Voltage Comparator IC
• Manufacturer: National Semiconductor

Specifications of LM2903M

• No. Of Comparators: 2
• Response Time: 1.5µs
• No. Of Pins: 8
• Output Type: CMOS, MOS, TTL, DTL, ECL
• Single Supply Voltage Min (+v): 2V
• Mounting Type: Surface Mount
• Peak Reflow Compatible (260 C): No
• Comparator Type: Precision
• Ic Output Type: CMOS, MOS, TTL, DTL, ECL
• Output Compatibility: CMOS, DTL, ECL, MOS, TTL
• Supply Current: 1mA
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Application Hints
The LM193 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
change 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 the input re-
sistors to
finally, adding even a small amount (1.0 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 input pins of any unused comparators should be tied to
the negative supply.
The bias network of the LM193 series establishes a drain
current which is independent of the magnitude of the power
supply voltage over the range of from 2.0 V
It is usually unnecessary to use a bypass capacitor across
the power supply line.
Typical Applications
Squarewave Oscillator
<
Basic Comparator
10 kΩ reduces the feedback signal levels and
00570935
00570938
(V
+
=5.0 V
* For large ratios of R1/R2,
D1 can be omitted.
DC
DC
to 30 V
)
DC
Pulse Generator
Driving CMOS
.
8
The differential input voltage may be larger than V
damaging the device (Note 8). Protection should be provided
to prevent the input voltages from going negative more than
−0.3 V
shown in the applications section.
The output of the LM193 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 LM193 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 16mA), 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 (1.0mV) allows the output to
clamp essentially to ground level for small load currents.
+
) and the β of this device. When the maximum current limit
00570936
DC
(at 25˚C). An input clamp diode can be used as
00570939
SAT
of the output transistor. The low offset
Crystal Controlled Oscillator
Driving TTL
+
00570937
+
terminal
00570940
without