This product is a high-speed binary ripple carry counter. It is implemented using advanced silicon-gate CMOS technology to achieve speed performance similar to LS-TTL logic while retaining the low power and high noise immunity of CMOS. The product model is MM74HC4020, which is a 14-bit counter. The product model is MM74HC4040, which is a 12-bit counter. Both products are incremented on the falling edge (negative transition) of the input clock, and all their outputs are reset to a low level by applying a logical high on their reset input. This product's pinout is equivalent to the CD4020 and CD4040 respectively. All inputs are protected from damage due to static discharge by protection diodes to VCC and ground.
The MM74HC4020 (14‑stage) and MM74HC4040 (12‑stage) are high‑speed binary ripple‑carry counters implemented in advanced silicon‑gate CMOS technology. They operate from 2 V to 6 V, feature low input and quiescent currents, and provide TTL‑compatible output drive.
The datasheet lists absolute maximum ratings, DC and AC electrical characteristics, typical propagation delays of 16 ns, maximum operating frequencies up to 30 MHz, and detailed mechanical dimensions for SOIC, SOP, PDIP and TSSOP packages. It also includes connection and logic diagrams, ordering codes, and a life‑support policy disclaimer.
| Typical propagation delay | 16 ns |
|---|---|
| Operating voltage range | 2‑6 V |
| Low input current | 1 µA max |
| Low quiescent current | 80 µA max |
| Output drive capability | 10 LS‑TTL loads |
| Operating temperature range | ‑65 °C to +150 °C |
Both devices operate from 2 V to 6 V.
The MM74HC4020 is a 14‑stage counter and the MM74HC4040 is a 12‑stage counter.
The typical propagation delay is 16 ns.