| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | MM54HC191 | MM54HC190/MM74HC190 Synchronous Decade Up/Down Counters with Mode Control MM54HC191/MM74HC191 Synchronous Binary Up/Down Counters with Mode Control | 207K |
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| 2 | MM54HC191J | MM54HC190/MM74HC190 Synchronous Decade Up/Down Counters with Mode Control MM54HC191/MM74HC191 Synchronous Binary Up/Down Counters with Mode Control | 207K |
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