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| Part Number | 74ACT521SJX | 74AC521SJX | 74ACT520SJX | 74ACT521SCX | 74ACT521SJ |
|---|---|---|---|---|---|
| Manufacturer | onsemi | Fairchild Semiconductor | onsemi | onsemi | Fairchild Semiconductor |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Type | Identity Comparator | Identity Comparator | Identity Comparator | Identity Comparator | Identity Comparator |
| Number of Bits | 8 | 8 | 8 | 8 | 8 |
| Output | Active Low | Active Low | Active Low | Active Low | Active Low |
| Output Function | A=B | A=B | A=B | A=B | A=B |
| Voltage - Supply | 4.5V ~ 5.5V | 2V ~ 6V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Current - Output High, Low | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA |
| Max Propagation Delay @ V, Max CL | 10ns @ 5V, 50pF | 8.5ns @ 5V, 50pF | 10ns @ 5V, 50pF | 10ns @ 5V, 50pF | 10ns @ 5V, 50pF |
| Current - Quiescent (Iq) | 4 µA | 4 µA | 4 µA | 4 µA | 4 µA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) | 20-SOIC (0.209", 5.30mm Width) | 20-SOIC (0.209", 5.30mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 20-SOP | 20-SOP | 20-SOP | 20-SOIC | 20-SOP |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
