| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
|---|
| 1 | HD74HC668 | Synchronous UP/Down Decade,4-bit binary Counter | 86K |
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| 2 | HD74HC668 | Synchronous UP/Down Decade Counter, Synchronous Up/Down 4-bit binary Counter | 227K |
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| 3 | HD74HC668/HD74HC669 | 81K |
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| 4 | HD74HC668RPEL | Synchronous UP/Down Decade Counter, Synchronous Up/Down 4-bit binary Counter | 227K |
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