| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN75C3221DBR | 3-V TO 5.5-V SINGLE CHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER | 292K |
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| 2 | SN75C3221DBR | 3-V TO 5.5-V SINGLE CHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER | 292K |
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| 3 | SN75C3221DBR | 3-V TO 5.5-V SINGLE CHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER | 296K |
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| 4 | SN75C3221DBRE4 | 3-V TO 5.5-V SINGLE CHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER | 296K |
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