| Parameters | 
                                    
                                                                                                            
                                        | Mfr | 
                                        Fairchild Semiconductor | 
                                    
                                                                        
                                        | Series | 
                                        74ALS | 
                                    
                                                                        
                                        | Package | 
                                        Tube | 
                                    
                                                                        
                                        | Product Status | 
                                        Obsolete | 
                                    
                                                                        
                                        | Type | 
                                        Identity Comparator | 
                                    
                                                                        
                                        | Number of Bits | 
                                        8 | 
                                    
                                                                        
                                        | Output | 
                                        Active Low | 
                                    
                                                                        
                                        | Output Function | 
                                        A=B | 
                                    
                                                                        
                                        | Voltage - Supply | 
                                        4.5V ~ 5.5V | 
                                    
                                                                        
                                        | Current - Output High, Low | 
                                        2.6mA, 24mA | 
                                    
                                                                        
                                        | Max Propagation Delay @ V, Max CL | 
                                        20ns @ 5V, 50pF | 
                                    
                                                                        
                                        | Operating Temperature | 
                                        0°C ~ 70°C | 
                                    
                                                                        
                                        | Package / Case | 
                                        20-DIP (0.300", 7.62mm) | 
                                    
                                                                        
                                        | Supplier Device Package | 
                                        20-PDIP | 
                                    
                                                                        
                                        | Mounting Type | 
                                        Through Hole | 
                                    
                                                                        
                                        | Base Product Number | 
                                        74ALS521 | 
                                    
                                                                        
                                        | RoHS Status | 
                                        ROHS3 Compliant | 
                                    
                                                                        
                                        | ECCN | 
                                        EAR99 | 
                                    
                                                                        
                                        | HTSUS | 
                                        8542.39.0001 | 
                                    
                                                                        
                                        | Standard Package | 
                                        18 | 
                                    
                                                                                                        
                            
                         
                                                Magnitude Comparator Bit Active Low Output A=B 20-PDIP