HEF4938B_1182336

The HEF4938B is a dual etriggerable-resettable monostable ultivibrator. Each multivibrator has n active LOW trigger/retrigger input I₀), an active HIGH trigger/retrigger nput (I₁), an overriding active LOW irect reset input (C_D), an output (O) nd its complement (O), and two pins C_TC and RC_TC) for connecting the xternal timing components C_t and t. Typical pulse width variation over emperature range is ±0.2%.

The HEF4938B may be triggered by ither the positive or the negative dges of the input pulse and will roduce an accurate output pulse ith a pulse width range of 10 µsto nfinity. The duration and accuracy of he output pulse are determined by he external timing componentsC_t and R_t. The output pulse width (T) s equal to R_t × C_t. The linear design echniques in LOCMOS guarantee recise control of the output pulse idth. A LOW level at C_D terminates he output pulse immediately.

Schmitt-trigger action in the inputs akes the circuit highly tolerant for lower rise and fall times.