lmc6772aimx National Semiconductor Corporation, lmc6772aimx Datasheet - Page 8

• Manufacturer Part Number: lmc6772aimx
• Description: Dual Micropower Rail-to-rail Input Cmos Comparator With Open Drain Output
• Manufacturer: National Semiconductor Corporation

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Typical Applications
Universal Logic Level Shifter
The output of the LMC6772 is the uncommitted drain of the
output NMOS transistor. Many drains can be tied together to
provide an output OR’ing function. An output pullup resistor
can be connected to any available power supply voltage
within the permitted power supply range.
The two 1 k
supply voltage. The pull-up resistor should go to the output
logic supply. Due to its wide operating range, the LMC6772
is ideal for the logic level shifting applications.
One-Shot Multivibrator
A monostable multivibrator has one stable state in which it
can remain indefinitely. It can be triggered externally to an-
other quasi-stable state. A monostable multivibrator can thus
be used to generate a pulse of desired width.
The desired pulse width is set by adjusting the values of C
and R
termine the magnitude of the input trigger pulse. The
LMC6772 will change state when V
vides a rapid discharge path for capacitor C
end of the pulse. The diode also prevents the non-inverting
input from being driven below ground.
4
. The resistor divider of R
FIGURE 4. Universal Logic Level Shifter
FIGURE 5. One-Shot Multivibrator
resistors bias the input to half of the power
1
and R
1
(Continued)
<
2
can be used to de-
V
2
. Diode D
2
to reset at the
DS012347-27
DS012347-28
2
pro-
2
8
Bi-Stable Multivibrator
A bi-stable multivibrator has two stable states. The reference
voltage is set up by the voltage divider of R
applied to the SET terminal will switch the output of the com-
parator high. The resistor divider of R
clamps the non-inverting input to a voltage greater than the
reference voltage. A pulse applied to RESET will now toggle
the output low.
Zero Crossing Detector
A voltage divider of R
age V
tance of R
when V
−0.7V. The voltage divider of R
from going below ground. A small amount of hysteresis is
setup to ensure rapid output voltage transitions.
1
at the non-inverting input. By making the series resis-
IN
= 0. Diode D
1
FIGURE 7. Zero Crossing Detector
FIGURE 6. Bi-Stable Multivibrator
and R
2
equal to R
4
and R
1
insures that V
5
5
establishes a reference volt-
, the comparator will switch
2
and R
3
1
3
, R
never drops below
then prevents V
2
and R
4
, and R
DS012347-29
3
DS012347-30
. A pulse
5
now
2