CD74HCT4040E.A中文资料德州仪器数据手册PDF规格书

1 Features

• Fully static operation

• Buffered inputs

• Common reset

• Negative edge pulsing

• 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

– 2 V to 6 V operation

– High noise immunity: NIL = 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 = 2V (Min)

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

2 Description

The ’HC4040 and ’HCT4040 are 14-stage ripple-carry

binary counters. All counter stages are controller

flipflops. 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.