Decade And Binary Counters - National Semiconductor

Each of these monolithic Counters DM5490 DM7490A DM7493A 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 for the 90A and divide- by-eight for the 93A. All of these Counters have a gated zero reset and the 90A also has gated set-to-nine inputs for use in BCD nines com- plement applications. To use their maximum count length (decade or four-bit bina- ry), 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 di- vide-by-ten count CAN be obtained from the 90A 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. By National Semiconductor Corporation
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DM5490 Pinout, Pinouts
DM5490 pinout,Pin out
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