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74LS90 Datasheet Decade And Binary Counters

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: DM74LS90 DM74LS93 Decade and Binary Counters June 1989 DM74LS90 DM74LS93 Decade and Binary.

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 ’LS90 and divideby-eight for the ’LS93 All of these counters have a gated zero reset and the LS90 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 ’LS90 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

Key Features

  • Y Y Typical power dissipation 45 mW Count frequency 42 MHz Connection Diagrams (Dual-In-Line Packages) TL F 6381.
  • 1 Order Number DM74LS90M or DM74LS90N See NS Package Number M14A or N14A TL F 6381.
  • 2 Order Number DM74LS93M or DM74LS93N See NS Package Number M14A or N14A C1995 National Semiconductor Corporation TL F 6381 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semicond.

Similar Datasheet

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Texas Instruments Logo 74LS90 DIVIDE-BY-TWELVE AND BINARY COUNTERS Texas Instruments

More Datasheets from National Semiconductor (now Texas Instruments)

Part Number Description
74LS93 Decade and Binary Counters
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74LS90 Distributor