CD74HC4020E集成电路（IC）的计数器除法器规格书PDF中文资料

CD74HC4020E属于集成电路（IC）的计数器除法器。由德州仪器制造生产的CD74HC4020E计数器，除法器计数器和除法器 IC 是数字逻辑器件，可对输入发生的逻辑转换进行计数，然后使用多个并行输出重新发送累加的计数，和/或生成单个输出信号转换，从而对应用某些整数数量输入信号转换进行响应。除了简单的事件计数，它们还可用于各种频率合成应用。

1 Features

• 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℃ to 125℃

• Balanced propagation delay and transition times

• Significant power reduction compared to LSTTL

Logic ICs

• HC types

– 2 V to 6 V operation

– High noise immunity: NIL = 30%, NIH = 30% of

VCC at VCC = 5 V

• HCT types

– 4.5 V to 5.5 V operation

– Direct LSTTL input logic compatibility, VIL = 0.8

V (max), VIH = 2 V (min)

– CMOS input compatibility, II ≤ 1 μA at VOL,VOH

2 Description

The ’HC4020 and ’HCT4020 are 14-stage ripple-carry

binary counters. All counter stages are controller/

peripheral 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.