74LS90 Information is available here.
Part Number : 74LS90, DM74LS90M, DM74LS90N
Function : Decade and Binary Counters.
Package : DIP, SOIC 14 Pin Type
Manufacturer : Fairchild Semiconductor
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DM74LS90 Decade and Binary Counters
Description
Each of these monolithic counters contains four masterslave flipflops and additional gating to provide a dividebytwo counter and a threestage binary counter for which the count cycle length is dividebyfive for the DM74LS90. All of these counters have a gated zero reset and the DM74LS90 also has gated settonine 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 dividebyten count can be obtained from the DM74LS90 counters by connecting the QD output to the A input and applying the input count to the B input which gives a dividebyten square wave at output QA.
Features
1. Typical power dissipation 45 mW
2. Count frequency 42 MHz
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74LS90 PDF File
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