1. General description

The HEF4020B is a 14-stage binary ripple counter with a clock input (CP), an overriding

asynchronous master reset input (MR) and 12 buffered parallel outputs (Q0, and Q3 to Q13). The

counter advances on the HIGH-to-LOW transition of CP. A HIGH on MR clears all counter stages

and forces all outputs LOW, independent of the state of CP. Each counter stage is a static toggle

flip-flop. Inputs include clamp diodes. This enables the use of current limiting resistors to interface

inputs to voltages in excess of VDD.

2. Features and benefits

• Wide supply voltage range from 3.0 V to 15.0 V

• CMOS low power dissipation

• High noise immunity

• High speed operation

• Fully static operation

• 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