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Part Number : 7490

Function : Decade and Binary Counter

Package : DIP 14 Pin Type

Manufacturers : Fairchild Semiconductor

Pinouts :

 

Description :

The DM7490A monolithic counter

contains four master slave flip-flops and additional gating to provide a divide-by two counter and a three-stage binary counter for which the count cycle length is divide-by-five. The counter has a gated zero reset and also has gated set to-nine inputs for use in BCD nine’s complement applications.

To use the maximum count length (decade or four-bit binary), the B input is connected to the QAoutput. 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 counters by connecting the QDoutput to the A input and applying the input count to the B input which gives a divide-by-ten square wave at output QA.

Logic Diagram

Other data sheets within the file : 7490, DM7490A, DM7490AN

IC 7490 Datasheet PDF