HEF4538BT,653 Monostable, dual, 3 ... 15 V, SO-16

Monostable multivibrator with double precision The HEF4538B is a dual retriggerable, resettable monostable multivibrator. Each multivibrator has an active LOW trigger/retrigger input (I0), an active HIGH trigger/retrigger input (I1), a higher-level active LOW direct reset input (CD), an output (O) and its complement (O) as well as two pins (CTC, (1) RCTC) for connecting the external timing components Ct and Rt. The typical pulse width variation over the temperature range is ± 0.2%. The HEF4538B can be triggered by either the positive or negative edge of the input pulse and generates a precise output pulse with a pulse width range from 10 µs to infinity. The duration and accuracy of the output pulse are determined by the external timing components Ct and Rt. The output pulse width (T) is equal to Rt × Ct. The linear design techniques in LOCMOS guarantee precise control of the output pulse width. A LOW level at CD terminates the output pulse immediately. The Schmitt trigger action in the trigger inputs makes the circuit very tolerant of slower rise and fall times.