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5490 Datasheet Decade and Binary Counters

Manufacturer: National Semiconductor (now Texas Instruments)

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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 90A and divideby-eight for the 93A All of these counters have a gated zero reset and the 90A also has gated set-to-nine inputs for use in BCD nine’s complement applications To use their maximum count length (decade or four-bit binary) the B input is connected to the QA output The input count pulses are applied to input A and the outputs are as described in the appropriate truth table A symmetrical divide-by-ten count can be obtained from the 90A counters by connecting the QD output to the A input and applying the input count to the B input which gives a divide-by-ten square wave at output QA

Overview

DM5490 DM7490A DM7493A Decade and Binary Counters www.DataSheet4U.

Key Features

  • Y Typical power dissipation 90A 145 mW 93A 130 mW Y Count frequency 42 MHz Connection Diagrams Dual-In-Line Package TL F 6533.
  • 1 Order Number DM5490J DM5490W or DM7490AN See NS Package Number J14A N14A or W14B Dual-In-Line Package Order Number DM7493AN See NS Package Number N14A TL F 6533.
  • 2 C1995 National Semiconductor Corporation TL F 6533 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact.

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