onsemi Logic - Logic - Multivibrators - MC74HC4538AFEL MC74HC4538AFEL

The MC74HC4538AFEL is a dual precision monostable multivibrator that is retriggerable and resettable. It features a pinout compatible with the MC14538B and is designed to accept standard CMOS inputs, with compatibility for LSTTL outputs when pull-up resistors are used. The device can be triggered by both positive and negative edges of an input pulse, producing a precision output pulse that is independent of the trigger pulse width. Key specifications include an operating voltage range of 3.0 to 6.0 V, low input current of 1.0 µA, and the ability to drive up to 10 LSTTL loads. The output pulse width is determined by external timing components, Rx and Cx, and the device includes a reset function that forces the Q output low and the Q output high. The MC74HC4538AFEL is compliant with JEDEC Standard No. 7A and offers high noise immunity typical of CMOS devices. It is available in a SOEIAJ-16 package and is suitable for applications requiring precise timing control.