74HC4538A, Dual Precision Monostable Multivibrator (Retriggerable,Resettable),
The MC74HC4538A is identical in pinout to the MC14538B.
The device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LSTTL outputs.
This dual monostable multivibrator may be triggered by either the
positive or the negative edge of an input pulse, and produces
a precision output pulse over a wide range of pulse widths. Because
the device has conditioned trigger inputs, there are no trigger−input
rise and fall time restrictions. The output pulse width is determined by
the external timing components, Rx and Cx. The device has a reset
function which forces the Q output low and the Q output high,
regardless of the state of the output pulse circuitry
