| Parameters | 
                                    
                                                                                                                        
                                                | Mfr | 
                                                Microchip Technology | 
                                            
                                                                                    
                                                | Series | 
                                                - | 
                                            
                                                                                    
                                                | Package | 
                                                Tray | 
                                            
                                                                                    
                                                | Product Status | 
                                                Obsolete | 
                                            
                                                                                    
                                                | Memory Type | 
                                                Non-Volatile | 
                                            
                                                                                    
                                                | Memory Format | 
                                                EEPROM | 
                                            
                                                                                    
                                                | Technology | 
                                                EEPROM | 
                                            
                                                                                    
                                                | Memory Size | 
                                                256Kbit | 
                                            
                                                                                    
                                                | Memory Organization | 
                                                32K x 8 | 
                                            
                                                                                    
                                                | Memory Interface | 
                                                Parallel | 
                                            
                                                                                    
                                                | Write Cycle Time - Word, Page | 
                                                10ms | 
                                            
                                                                                    
                                                | Access Time | 
                                                70 ns | 
                                            
                                                                                    
                                                | Voltage - Supply | 
                                                4.5V ~ 5.5V | 
                                            
                                                                                    
                                                | Operating Temperature | 
                                                -40°C ~ 85°C (TC) | 
                                            
                                                                                    
                                                | Mounting Type | 
                                                Surface Mount | 
                                            
                                                                                    
                                                | Package / Case | 
                                                28-TSSOP (0.465", 11.80mm Width) | 
                                            
                                                                                    
                                                | Supplier Device Package | 
                                                28-TSOP | 
                                            
                                                                                    
                                                | Base Product Number | 
                                                AT28HC256 | 
                                            
                                                                                    
                                                | RoHS Status | 
                                                ROHS3 Compliant | 
                                            
                                                                                    
                                                | Moisture Sensitivity Level (MSL) | 
                                                3  (168 Hours) | 
                                            
                                                                                    
                                                | REACH Status | 
                                                REACH Unaffected | 
                                            
                                                                                    
                                                | ECCN | 
                                                EAR99 | 
                                            
                                                                                    
                                                | HTSUS | 
                                                8542.32.0051 | 
                                            
                                                                                    
                                                | Other Names | 
                                                AT28HC25670TU | 
                                            
                                                                                    
                                                | Standard Package | 
                                                234 | 
                                            
                                                                                                                
                                
                             
                                                EEPROM Memory IC 256Kbit Parallel 70 ns 28-TSOP