| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | HEF4520B | Dual binary counter | 64K |
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| 2 | HEF4520B | Dual binary counter | 69K |
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| 3 | HEF4520B | Dual binary counter | 70K |
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| 4 | HEF4520BD | Dual binary counter | 69K |
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| 5 | HEF4520BD | Dual binary counter | 70K |
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| 6 | HEF4520BF | Dual binary counter | 69K |
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| 7 | HEF4520BF | Dual binary counter | 70K |
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| 8 | HEF4520BN | Dual binary counter | 69K |
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| 9 | HEF4520BN | Dual binary counter | 70K |
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| 10 | HEF4520BP | COUNTER|UP|4-BIT BINARY|CMOS|DIP|16PIN|PLASTIC | 64K |
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| 11 | HEF4520BP | Dual binary counter | 69K |
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| 12 | HEF4520BP | Dual binary counter | 70K |
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| 13 | HEF4520BPN | Synchronous Up Counter | 94K |
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| 14 | HEF4520BT | IC-SM-4000 LOCMOS | 64K |
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| 15 | HEF4520BT | Dual binary counter | 69K |
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| 16 | HEF4520BT | Dual binary counter | 70K |
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| 17 | HEF4520BTD | Synchronous Up Counter | 94K |
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| 18 | HEF4520BTD-T | Synchronous Up Counter | 94K |
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