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| 74F521PC | 8-Bit Identity Comparator | Fairchild Semiconductor | MDIP | 20 | N/A | N/A | 74F521PC datasheet (68K) |
| 74F521SC | 8-Bit Identity Comparator | Fairchild Semiconductor | SOIC | 20 | N/A | N/A | 74F521SC datasheet (68K) |
| 74F521SCX | 8-Bit Identity Comparator | Fairchild Semiconductor | SOIC | 20 | N/A | N/A | 74F521SCX datasheet (68K) |
| 74F521SJ | 8-Bit Identity Comparator | Fairchild Semiconductor | SOIC | 20 | N/A | N/A | 74F521SJ datasheet (68K) |
| 74F521SJX | 8-Bit Identity Comparator | Fairchild Semiconductor | SOIC | 20 | N/A | N/A | 74F521SJX datasheet (68K) |
| 74F524CW | 8-Bit Registered Comparator | Fairchild Semiconductor | N/A | - | N/A | N/A | 74F524CW datasheet (74K) |
| 74F524PC | 8-Bit Registered Comparator | Fairchild Semiconductor | MDIP | 20 | N/A | N/A | 74F524PC datasheet (74K) |
| 74F524PC | 8-Bit Registered Comparator | Fairchild Semiconductor | MDIP | 20 | N/A | N/A | 74F524PC datasheet (74K) |
| 74F524SC | 8-Bit Registered Comparator | Fairchild Semiconductor | SOIC | 20 | N/A | N/A | 74F524SC datasheet (74K) |
| 74F524SCX | 8-Bit Registered Comparator | Fairchild Semiconductor | SOIC | 20 | N/A | N/A | 74F524SCX datasheet (74K) |