General Description
●The MM74HC4020, MM74HC4040, are high speed binary ripple carry counters. These counters are implemented utilizing 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 MM74HC4020 is a 14 stage counter and the MM74HC4040 is a 12-stage counter. Both devices 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.
●These devices are pin equivalent to the CD4020 and CD4040 respectively. All inputs are protected from damage due to static discharge by protection diodes to VCC and ground.
●Features
●■ Typical propagation delay: 16 ns
●■ Wide operating voltage range: 2–6V
●■ Low input current: 1 µA maximum
●■ Low quiescent current: 80 µA maximum (74HC Series)
●■ Output drive capability: 10 LS-TTL loads
