Nexperia HEF4538BT,653, 2 Monostable Multivibrator HEF 2.4 mA, 16-Pin SO

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 complement (nQ), and two pins (nREXT/CEXT, and nCEXT, always connected to ground) for connecting the external timing components CEXT and REXT. Typical pulse width variation over the specified temperature range is ±0.2 %. The multivibrator may be triggered by either the positive or the negative edges of the input pulse and will produce an accurate output pulse with a pulse width range of 10 μs to infinity. The duration and accuracy of the output pulse are determined by the external timing components CEXT and REXT.

• Simple control interface
• Power on reset
• Dual devices with separate reset inputs
• Negative or positive edge triggered
• CMOS low power
• Key applications
• Timing delays in control circuits