NEXPERIA 74HC4538PW,118

74HC4538PW,118 is a dual retriggerable-resettable monostable multivibrator. Each multivibrator has two trigger/retrigger inputs (n active-low A and nB), a direct reset input (n active-low CD), two complementary outputs (nQ and n active-low Q), and two pins (nREXT/CEXT and nCEXT) for connecting the external timing components CEXT and REXT. Typical pulse width variation over the temperature range is ±0.2%. This device may be triggered by either the positive or the negative edges of the input pulse. The duration and accuracy of the output pulse are determined by the external timing components CEXT and REXT. The output pulse width (TW) is equal to 0.7 × REXT × CEXT. The linear design techniques guarantee precise control of the output pulse width. A LOW level at n active-low CD terminates the output pulse immediately. Schmitt-trigger action in the trigger inputs makes the circuit highly tolerant to slower rise and fall times. Inputs include clamp diodes.