LMV331-N Datasheet, PDF (9/33 Pages) Texas Instruments – LMV331-N Single LMV393-N Dual LMV339-N Quad General Purpose, Low Voltage, Tiny

LMV331-N, LMV339-N, LMV393-N
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SNOS018G – AUGUST 1999 – REVISED FEBRUARY 2013
The total hysteresis provided by the network is defined as
ΔV_a = V_a1 - V_a2
(3)
To assure that the comparator will always switch fully to V_CC and not be pulled down by the load the resistors
values should be chosen as follow:
R_PULL-UP << R_LOAD
(4)
and R₁ > R_PULL-UP.
(5)
Figure 13. Inverting Comparator with Hysteresis
NON-INVERTING COMPARATOR WITH HYSTERESIS
Non inverting comparator with hysteresis requires a two resistor network, and a voltage reference (V_ref) at the
inverting input. When V_in is low, the output is also low. For the output to switch from low to high, V_in must rise up
to V_in1 where V_in1 is calculated by
(6)
When V_in is high, the output is also high, to make the comparator switch back to it's low state, V_in must equal V_ref
before V_A will again equal V_ref. V_in can be calculated by:
(7)
The hysteresis of this circuit is the difference between V_in1 and V_in2.
ΔV_in = V_CCR₁/R₂
(8)
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