lmc6772aimx National Semiconductor Corporation, lmc6772aimx Datasheet - Page 9

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

Typical Applications
Oscillator
The circuit shown above provides output signals at a pre-
scribed time interval from a time reference and automatically
resets the output when the input returns to ground. Consider
the case of V
FIGURE 8. Square Wave Generator
IN
= 0. The output of comparator 4 is also at
(Continued)
FIGURE 9. Time Delay Generator
DS012347-31
Time Delay Generator
9
Figure 8 shows the application of the LMC6772 in a square
wave generator circuit. The total hysteresis of the loop is set
by R
discharge paths for the capacitor C. The charge path is set
through R
the RC time constant of R
path for the capacitor is set by R
between the pulses can be changed by varying R
pulse width can be altered by R
put can be changed by varying both R
ground. This implies that the outputs of comparators 1, 2,
and 3 are also at ground. When an input signal is applied,
the output of comparator 4 swings high and C charges expo-
nentially through R. This is indicated above. The output volt-
1
, R
2
4
and R
and D
3
. R
1
. So, the pulse width t
4
and R
4
and C. Similarly, the discharge
5
provide separate charge and
4
5
. The frequency of the out-
and D
4
DS012347-32
and R
2
1
. Thus, the time t
is determined by
5
.
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5
, and the
2