| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | HD74LS640-1 | Octal Bus Transceivers(inverted 3-state outputs) | 60K |
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| 2 | HD74LS640-1 | Ouadruple 2-input Positive NAND Gates | 7129K |
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| 3 | HD74LS640-1P | BUS TRANSCEIVER|SINGLE|8-BIT|LS-TTL|DIP|20PIN|PLASTIC | 60K |
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