74LS90 Datasheet – Decade and Binary Counter ( PDF )

This post explains for the TTL.

The Part Number is 74LS90.

The function of this semiconductor is Decade and Binary Counter.

Manufacturers : National Semiconductor

Preview images :

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74LS image

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 Features Y Y Typical power dissipation 45 m […]

Features :

1. Typical power dissipation 45 mW
2. Count frequency 42 MHz

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74LS90 Datasheet

74LS90 pdf