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.

Features

• Unlimited Rise and Fall Times Allowed on the Trigger Inputs

• Output Pulse is Independent of the Trigger Pulse Width

• ± 10 Guaranteed Pulse Width Variation from Part to Part

(Using the Same Test Jig)

• Output Drive Capability: 10 LSTTL Loads

• Outputs Directly Interface to CMOS, NMOS and TTL

• Operating Voltage Range: 3.0 to 6.0 V

• Low Input Current: 1.0 μA

• High Noise Immunity Characteristic of CMOS Devices

• In Compliance with the Requirements Defined by JEDEC Standard No. 7A

• Chip Complexity: 145 FETs or 36 Equivalent Gates

• Pb−Free Packages are Available*