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MM74HC123A Datasheet(PDF) 6 Page - Fairchild Semiconductor

Part No. MM74HC123A
Description  Dual Retriggerable Monostable Multivibrator
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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MM74HC123A Datasheet(HTML) 6 Page - Fairchild Semiconductor

 
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6
Theory of Operation (Continued)
Reset Operation
These one shots may be reset during the generation of the
output pulse. In the reset mode of operation, an input pulse
on clear sets the reset latch and causes the capacitor to be
fast charged to VCC by turning on transistor Q1 5. When
the voltage on the capacitor reaches VREF2, the reset latch
will clear and then be ready to accept another pulse. If the
clear input is held low, any trigger inputs that occur will be
inhibited and the Q and Q outputs of the output latch will
not change. Since the Q output is reset when an input low
level is detected on the Clear input, the output pulse T can
be made significantly shorter than the minimum pulse width
specification.
Typical Output Pulse Width vs.
Timing Components
Typical Distribution of Output
Pulse Width, Part to Part
Typical 1ms Pulse Width Variation vs.
Supply
Minimum REXT vs.
Supply Voltage
Typical 1ms Pulse Width Variation vs.
Temperature
Note: R and C are not subjected to temperature. The C is polypropylene.


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