HEF4538B Overview
The HEF4538B is a dual retriggerable-resettable monostable multivibrator. Each multivibrator has an active LOW trigger/retrigger input (nA), an active HIGH trigger/retrigger input (nB), an overriding active LOW direct reset input (nCD), an output (nQ) and its plement (nQ), and two pins (nREXT/CEXT, and nCEXT, always connected to ground) for connecting the external timing ponents CEXT and REXT. Typical pulse width...
HEF4538B Key Features
- Tolerant of slow trigger rise and fall times
- Fully static operation
- 5 V, 10 V, and 15 V parametric ratings
- Standardized symmetrical output characteristics
- Specified from 40 C to +85 C and 40 C to +125 C
- plies with JEDEC standard JESD 13-B
- 1 April 2016

