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CD54HC4020 - 14-Stage Binary Counter

General 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.

Key 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 imm.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
CD54HC4020, CD74HC4020, CD54HCT4020, CD74HCT4020 SCHS201D – FEBRUARY 1998 – REVISED AUGUST 2022 CDx4HC4020, CDx4HCT4020 CDHigh-Speed CMOS Logic 14-Stage Binary Counter 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.