| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
|---|
| 1 | HD74LS21 | Dual 4-input Positive AND Gates | 44K |
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| 2 | HD74LS21 | Ouadruple 2-input Positive NAND Gates | 7129K |
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| 3 | HD74LS21 | Dual 4-input Positive AND Gates | 56K |
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| 4 | HD74LS21FPEL | Dual 4-input Positive AND Gates | 56K |
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| 5 | HD74LS21P | Dual 4-input AND Gate | 177K |
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| 6 | HD74LS21P | Dual 4-input Positive AND Gates | 56K |
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