| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
|---|
| 31 | SN74LS257BNSRG4 | QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS | 942K |
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| 32 | SN74LS257D | QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS | 187K |
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| 33 | SN74LS257N | QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS | 187K |
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