lmv7239m7x National Semiconductor Corporation, lmv7239m7x Datasheet - Page 10

• Manufacturer Part Number: lmv7239m7x
• Description: 45ns, Ultra Low Power, Low Voltage, Rail-to-rail Input Comparator With Open-drain/push-pull Output
• Manufacturer: National Semiconductor Corporation

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Application Information
NON-INVERTING COMPARATOR WITH HYSTERESIS
A non inverting comparator with hysteresis requires a two
resistor network, and a voltage reference (V
verting input. When V
output to switch from low to high, V
where V
When V
comparator switch back to it’s low state, V
before V
The hysteresis of this circuit is the difference between V
and V
Delta V
IN2
V
V
IN
IN1
IN2
IN1
IN
A
.
= V
will again equal V
is high, the output is also high, to make the
= R1*(V
= (V
is calculated by.
CC
REF
R1/R2
REF
(R1+ R2) - V
IN
/R2) + V
is low, the output is also low. For the
REF
REF
. V
CC
IN
R1)/R2
IN
can be calculated by
FIGURE 1. Inverting Comparator with Hysteresis
must rise up to V
IN
(Continued)
must equal V
REF
) at the in-
REF
IN1
IN1
10
FIGURE 2. Non-Inverting Comparator with Hysteresis
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