1. General description

The 74HC4020; 74HCT4020 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 VCC.

2. Features and benefits

• Wide supply voltage range from 2.0 V to 6.0 V

• CMOS low power dissipation

• High noise immunity

• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

• Complies with JEDEC standards:

• JESD8C (2.7 V to 3.6 V)

• JESD7A (2.0 V to 6.0 V)

• Input levels:

• For 74HC4020: CMOS level

• For 74HCT4020: TTL level

• ESD protection:

• HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

• Multiple package options

• Specified from -40 °C to +85 °C and from -40 °C to +125 °C

3. Applications

• Frequency dividing circuits

• Time delay circuits

• Control counters