This part is a kind of semiconductor called 7490.

Function of this product has Decade and Binary Counters.

Manufacturers : Fairchild Semiconductor

Image and pinout :

7490 image and datasheet pinout

Some of the text within the PDF file :

DM7490A Decade and Binary Counters August 1986 Revised March 2000 DM7490A Decade and Binary Counters General Description The DM7490A monolithic counter 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. The counter has a gated zero reset and also has gated setto-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 QA output. The input count pulses are applied to input A and the outputs are as described in the appropriate Function Table. A symmetrical divide-by-ten count can be obtained from the counters by connecting the QD output to the A input and applying the i [ ... ]

7490 PDF Datasheet Download

2017/06/05 10:30 2017/06/05 10:30