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.