| Parameters | 
                                                                                                            
                                            | Memory Organization | 256 x 4 | 
                                                                            
                                            | Memory Interface | Parallel | 
                                                                            
                                            | Write Cycle Time - Word, Page | - | 
                                                                            
                                            | Voltage - Supply | 4.5V ~ 5.5V | 
                                                                            
                                            | Operating Temperature | 0°C ~ 70°C (TA) | 
                                                                            
                                            | Mounting Type | Through Hole | 
                                                                            
                                            | Package / Case | 22-CDIP | 
                                                                            
                                            | Supplier Device Package | 22-CDIP | 
                                                                            
                                            | RoHS Status | RoHS non-compliant | 
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 2A  (4 Weeks) | 
                                                                            
                                            | REACH Status | REACH Unaffected | 
                                                                            
                                            | ECCN | EAR99 | 
                                                                            
                                            | HTSUS | 8542.32.0071 | 
                                                                            
                                            | Standard Package | 1 | 
                                                                            
                                            | Mfr | National Semiconductor | 
                                                                            
                                            | Series | 4721B | 
                                                                            
                                            | Package | Bulk | 
                                                                            
                                            | Product Status | Active | 
                                                                            
                                            | Memory Type | Volatile | 
                                                                            
                                            | Memory Format | RAM | 
                                                                            
                                            | Technology | RAM | 
                                                                            
                                            | Memory Size | 1Kbit | 
                                                                                                    
                            
                         
                                                RAM Memory IC 1Kbit Parallel 22-CDIP