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HD74HC4518 - Dual BCD Up Counters

Description

The HD74HC4518 dual BCD counter and the HD74HC4520 dual binary counter consist of two identical, independent, internally synchronous 4-stage counters.

Features

  • High Speed Operation.
  • High Output Current: Fanout of 10 LSTTL Loads.
  • Wide Operating Voltage: VCC = 2 to 6 V.
  • Low Input Current: 1 µA m.

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Full PDF Text Transcription

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HD74HC4518, HD74HC4520 Dual BCD Up Counters Dual Binary Up Counters REJ03D0653–0200 (Previous ADE-205-542) Rev.2.00 Mar 30, 2006 Description The HD74HC4518 dual BCD counter and the HD74HC4520 dual binary counter consist of two identical, independent, internally synchronous 4-stage counters. The counter stages are type D flip-flops, with interchangeable Clock and Enable lines for incrementing on either the positive-going or negative-going transition as required when cascading multiple stages. Each counter can be cleared by applying a high level on the Reset line. In addition, the HD74HC4518 will count out of all undefined states within two clock periods.
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