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LMC6772 Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LMC6772
Description  Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMC6772 Datasheet(HTML) 8 Page - National Semiconductor (TI)

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Typical Applications (Continued)
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
2
and R
4. The resistor divider of R1 and R2 can be used to de-
termine the magnitude of the input trigger pulse. The
LMC6772 will change state when V
1 < V2. Diode D2 pro-
vides a rapid discharge path for capacitor C
2 to reset at the
end of the pulse. The diode also prevents the non-inverting
input from being driven below ground.
Bi-Stable Multivibrator
A bi-stable multivibrator has two stable states. The reference
voltage is set up by the voltage divider of R
2 and R3. A pulse
applied to the SET terminal will switch the output of the com-
parator high. The resistor divider of R
1,R4, and R5 now
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
4 and R5 establishes a reference volt-
age V
1 at the non-inverting input. By making the series resis-
tance of R
1 and R2 equal to R5, the comparator will switch
when V
IN = 0. Diode D1 insures that V3 never drops below
−0.7V. The voltage divider of R
2 and R3 then prevents V2
from going below ground. A small amount of hysteresis is
setup to ensure rapid output voltage transitions.
Oscillator
Figure 8 shows the application of the LMC6772 in a square
wave generator circuit. The total hysteresis of the loop is set
by R
1,R2 and R3.R4 and R5 provide separate charge and
discharge paths for the capacitor C. The charge path is set
through R
4 and D1. So, the pulse width t1 is determined by
the RC time constant of R
4 and C. Similarly, the discharge
path for the capacitor is set by R
5 and D2. Thus, the time t2
between the pulses can be changed by varying R
5, and the
pulse width can be altered by R
4. The frequency of the out-
put can be changed by varying both R
4 and R5.
DS012347-28
FIGURE 5. One-Shot Multivibrator
DS012347-30
FIGURE 6. Bi-Stable Multivibrator
DS012347-29
FIGURE 7. Zero Crossing Detector
DS012347-31
FIGURE 8. Square Wave Generator
www.national.com
8


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