| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN54AS621 | OCTAL BUS TRANSCEIVER | 489K |
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| 2 | SN54AS621A | OCTAL BUS TRANSCEIVER | 489K |
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| 3 | SN54AS621FK | OCTAL BUS TRANSCEIVER | 489K |
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| 4 | SN54AS621J | OCTAL BUS TRANSCEIVER | 489K |
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