1. General description
The HEF4528B is a dual retriggerable-resetable monostable multivibrator. Each multivibrator has
an active LOW input (nA), and active HIGH input (nB), an active LOW clear direct input (nCD), an
output (nQ) and its complement (nQ), and two external timing component connecting pins (nCEXT,
always connected to ground, and nREXT/CEXT).
An external timing capacitor (CEXT) must be connected between nCEXT and nREXT/CEXT and
an external resistor (REXT) must be connected between nREXT/CEXT and VDD. The output
pulse duration is determined by the external timing components CEXT and REXT. A HIGH-to-LOW
transition on nA when nB is LOW or a LOW-to-HIGH transition on nB when nA is HIGH produces
a positive pulse (LOW-HIGH-LOW) on nQ and a negative pulse (HIGH-LOW-HIGH) on nQ if the
nCD is HIGH. A LOW on nCD forces nQ LOW, nQ HIGH and inhibits any further pulses until nCD
is HIGH.
It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually
ground). Unused inputs must be connected to VDD, VSS, or another input.
2. Features and benefits
• Fully static operation
• Wide supply voltage range from 3.0 V to 15.0 V
• CMOS low power dissipation
• High noise immunity
• 5 V, 10 V, and 15 V parametric ratings
• Standardized symmetrical output characteristics
• Complies with JEDEC standard JESD 13-B
• ESD protection:
• HBM JESD22-A114F exceeds 2000 V
• MM JESD22-A115-B exceeds 200 V
• Specified from -40 °C to +85 °C