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MM54HC123A Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. MM54HC123A
Description  Dual Retriggerable Monostable Multivibrator
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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MM54HC123A Datasheet(HTML) 4 Page - National Semiconductor (TI)

   
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Logic Diagram
TLF5206 – 5
Theory of Operation
TLF5206 – 6
j
POSITIVE EDGE TRIGGER
m
POSITIVE EDGE RE-TRIGGER (PULSE LENGTHENING)
k
NEGATIVE EDGE TRIGGER
n
RESET PULSE SHORTENING
l
POSITIVE EDGE TRIGGER
o
CLEAR TRIGGER
FIGURE 1
TRIGGER OPERATION
As shown in
Figure 1 and the logic diagram before an input
trigger occurs the one shot is in the quiescent state with the
Q output low and the timing capacitor CEXT completely
charged to VCC When the trigger input A goes from VCC to
GND (while inputs B and clear are held to VCC) a valid trig-
ger is recognized which turns on comparator C1 and N-
channel transistor N1 j At the same time the output latch
is set With transistor N1 on the capacitor CEXT rapidly dis-
charges toward GND until VREF1 is reached At this point
the output of comparator C1 changes state and transistor
N1 turns off Comparator C1 then turns off while at the
same time comparator C2 turns on With transistor N1 off
the capacitor CEXT begins to charge through the timing re-
4


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