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| Part Number | 74F521DC | 74F521SC | 74F521PC | 54F521DC |
|---|---|---|---|---|
| Manufacturer | National Semiconductor | Fairchild Semiconductor | Fairchild Semiconductor | National Semiconductor |
| Product Status | Active | Obsolete | Obsolete | Active |
| Type | - | Identity Comparator | Identity Comparator | - |
| Number of Bits | 8 | 8 | 8 | - |
| Output | Active Low | Active Low | Active Low | - |
| Output Function | A=B | A=B | A=B | - |
| Voltage - Supply | - | 4.5V ~ 5.5V | 4.5V ~ 5.5V | - |
| Current - Output High, Low | 1mA, 20mA | 1mA, 20mA | 1mA, 20mA | - |
| Max Propagation Delay @ V, Max CL | 10ns @ 5V, 50pF | 10ns @ 5V, 50pF | 10ns @ 5V, 50pF | - |
| Current - Quiescent (Iq) | - | - | - | - |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | - |
| Package / Case | - | 20-SOIC (0.295", 7.50mm Width) | 20-DIP (0.300", 7.62mm) | - |
| Supplier Device Package | - | 20-SOIC | 20-PDIP | - |
| Mounting Type | Surface Mount | Surface Mount | Through Hole | - |
