CD74HC4020 - Texas Instruments

CD74HC4020 14-Stage Binary Counter

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. PART NUMBER Device I.

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.