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| Part Number | 74AC521MTCX | 74ACT521MTCX | 74AC521MTC | 
|---|---|---|---|
| Manufacturer | onsemi | Fairchild Semiconductor | onsemi | 
| Product Status | Obsolete | Obsolete | Obsolete | 
| Type | Identity Comparator | 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 | 2V ~ 6V | 4.5V ~ 5.5V | 2V ~ 6V | 
| Current - Output High, Low | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 
| Max Propagation Delay @ V, Max CL | 8.5ns @ 5V, 50pF | 10ns @ 5V, 50pF | 8.5ns @ 5V, 50pF | 
| Current - Quiescent (Iq) | 4 µA | 4 µA | 4 µA | 
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | 
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) | 20-TSSOP (0.173", 4.40mm Width) | 20-TSSOP (0.173", 4.40mm Width) | 
| Supplier Device Package | 20-TSSOP | 20-TSSOP | 20-TSSOP | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |