CD54HC4020

高速 CMOS 逻辑 14 级二进制计数器

The ’HC4020 and ’HCT4020 are 14-stage ripple-carry binary counters. All counter stages are master-slave flip-flops. The state of the stage advances one count on the negative clock transition of each input pulse; a high voltage level on the MR line resets all counters to their zero state. All inputs and outputs are buffered.

.

Fully Static Operation

.

Buffered Inputs

.

Common Reset

.

Negative Edge Clocking

.

Fanout Over Temperature Range

.

Standard Outputs...10 LSTTL Loads

.

Bus Driver Outputs...15 LSTTL Loads

.

Wide Operating Temperature Range... -55°C to 125°C

.

Balanced Propagation Delay and Transition Times

.

Significant Power Reduction Compared to LSTTL Logic ICs

.

HC Types

.

2V to 6V Operation

.

High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V

.

HCT Types

.

4.5V to 5.5V Operation

.

Direct LSTTL Input Logic Compatibility, VIL = 0.8V Max, VIH = 2V Min

.

CMOS Input Compatibility, Il 1µA at VOL, VOH