Typical Performance Characteristics LM2903 (Continued)
Application Hints
The LM193 series are high gain, wide bandwidth devices
which, like most comparators, can easily oscillate if the out-
put 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 resistors to
<10 kΩreduces the feedback signal levels and finally, add-
ing 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 hys-
teresis 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
DC
to 30 V
DC
.
It is usually unnecessary to use a bypass capacitor across
the power supply line.
The differential input voltage may be larger than V
+
without
damaging the device (Note 8). Protection should be provided
to prevent the input voltages from going negative more than
−0.3 V
DC
(at 25˚C). An input clamp diode can be used as
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
+
terminal
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
+
) and the βof this device. When the maximum current limit
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 60Ωr
SAT
of the output transistor. The low offset
voltage of the output transistor (1.0 mV) allows the output to
clamp essentially to ground level for small load currents.
Typical Applications (V
+
=5.0 V
DC
)
Response Time for Various
Input Overdrives— Negative
Transition
DS005709-33
Response Time for Various
Input Overdrives— Positive
Transition
DS005709-34
Basic Comparator
DS005709-35
Driving CMOS
DS005709-36
Driving TTL
DS005709-37
LM193/LM293/LM393/LM2903
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