These identity comparators perform comparisons on two 8-bit binary or BCD words. They provide 
outputs.
The SN54F521 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74F521 is characterized for operation from 0°C to 70°C.
| Number of channels | 8 |
| Technology family | F |
| Input type | Bipolar |
| Output type | Push-Pull |
| Features | Very high speed (tpd 5-10ns) |
| Operating temperature range (°C) | -55 to 125 |
| Rating | Military |
| CDIP (J) | 20 | 167.464 mm² 24.2 x 6.92 |
| CFP (W) | 20 | 90.5828 mm² 13.09 x 6.92 |
| LCCC (FK) | 20 | 79.0321 mm² 8.89 x 8.89 |
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