| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | DM74LS491 | 10-Bit Counter | 140K |
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| 2 | DM74LS491 | 10-Bit Counter | 140K |
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| 3 | DM74LS491AJ | Synchronous Up/Down Counter | 85K |
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| 4 | DM74LS491AN | Synchronous Up/Down Counter | 85K |
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| 5 | DM74LS491AV | Synchronous Up/Down Counter | 85K |
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| 6 | DM74LS491J | 10-Bit Counter | 140K |
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| 7 | DM74LS491J | 10-Bit Counter | 140K |
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| 8 | DM74LS491J/A+ | Synchronous Up/Down Counter | 85K |
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| 9 | DM74LS491J/B+ | Synchronous Up/Down Counter | 85K |
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| 10 | DM74LS491N | 10-Bit Counter | 140K |
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| 11 | DM74LS491N | 10-Bit Counter | 140K |
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| 12 | DM74LS491N/A+ | Synchronous Up/Down Counter | 85K |
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| 13 | DM74LS491N/B+ | Synchronous Up/Down Counter | 85K |
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