| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
|---|
| 1 | DM74LS491J | 10-Bit Counter | 140K |
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| 2 | DM74LS491J | 10-Bit Counter | 140K |
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| 3 | DM74LS491J/A+ | Synchronous Up/Down Counter | 85K |
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| 4 | DM74LS491J/B+ | Synchronous Up/Down Counter | 85K |
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