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| Part Number | SN74ALS520NSR | SN74ALS521NSR | 
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | 
| Product Status | Active | Active | 
| Type | Identity Comparator | Identity Comparator | 
| Number of Bits | 8 | 8 | 
| Output | Active Low | Active Low | 
| Output Function | A=B | A=B | 
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 
| Current - Output High, Low | 2.6mA, 24mA | 2.6mA, 24mA | 
| Max Propagation Delay @ V, Max CL | 20ns @ 5V, 50pF | 20ns @ 5V, 50pF | 
| Current - Quiescent (Iq) | - | - | 
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 
| Package / Case | 20-SOIC (0.209", 5.30mm Width) | 20-SOIC (0.209", 5.30mm Width) | 
| Supplier Device Package | 20-SO | 20-SO | 
| Mounting Type | Surface Mount | Surface Mount |