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DM74LS90N Datasheet Decade And Binary Counters

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: DM74LS90 Decade and Binary Counters August 1986 Revised March 2000 DM74LS90 Decade and Binary Counters.

This datasheet includes multiple variants, all published together in a single manufacturer document.

General Description

Each of these monolithic counters contains four masterslave flip-flops and additional gating to provide a divide-bytwo counter and a three-stage binary counter for which the count cycle length is divide-by-five for the DM74LS90.

All of these counters have a gated zero reset and the DM74LS90 also has gated set-to-nine inputs for use in BCD nine’s plement applications.

To use their maximum count length (decade or four bit binary), the B input is connected to the QA output.

Key Features

  • s Typical power dissipation 45 mW s Count frequency 42 MHz Ordering Code: Order Number Package Number Package.

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