The 5490 by National Semiconductor is a Decade and Binary Counters. Below is the official datasheet preview.
| Part number | 5490 |
|---|---|
| Manufacturer | National Semiconductor |
| File Size | 137.24 KB |
| Description | Decade and Binary Counters |
| Datasheet |
 5490_NationalSemiconductor.pdf
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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 90A and divideby-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 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
