| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | DM74LS191N | Synchronous 4-Bit Up/Down Counters with Mode Control | 178K |
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| 2 | DM74LS191N | Synchronous 4-Bit Up/Down Counter with Mode Control | 74K |
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| 3 | DM74LS191N | Synchronous 4-Bit Up/Down Counters with Mode Control | 178K |
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| 4 | DM74LS191N/A+ | Synchronous Up/Down Counter | 181K |
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| 5 | DM74LS191N/B+ | Synchronous Up/Down Counter | 181K |
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