| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
|---|
| 1 | DM74LS90N | Decade and Binary Counters | 62K |
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| 2 | DM74LS90N | Decade and Binary Counters | 135K |
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| 3 | DM74LS90N/A+ | Asynchronous Up Counter | 194K |
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| 4 | DM74LS90N/B+ | Asynchronous Up Counter | 194K |
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