| Parameters | 
                                                                                                                        
                                                | Mfr | Microchip Technology | 
                                                                                    
                                                | Series | FlashFlex® | 
                                                                                    
                                                | Package | Tube | 
                                                                                    
                                                | Product Status | Obsolete | 
                                                                                    
                                                | Core Processor | 8051 | 
                                                                                    
                                                | Core Size | 8-Bit | 
                                                                                    
                                                | Speed | 40MHz | 
                                                                                    
                                                | Connectivity | EBI/EMI, SPI, UART/USART | 
                                                                                    
                                                | Peripherals | Brown-out Detect/Reset, POR, WDT | 
                                                                                    
                                                | Number of I/O | 32 | 
                                                                                    
                                                | Program Memory Size | 24KB (24K x 8) | 
                                                                                    
                                                | Program Memory Type | FLASH | 
                                                                                    
                                                | EEPROM Size | - | 
                                                                                    
                                                | RAM Size | 1K x 8 | 
                                                                                    
                                                | Voltage - Supply (Vcc/Vdd) | 4.5V ~ 5.5V | 
                                                                                    
                                                | Data Converters | - | 
                                                                                    
                                                | Oscillator Type | External | 
                                                                                    
                                                | Operating Temperature | 0°C ~ 70°C | 
                                                                                    
                                                | Mounting Type | Through Hole | 
                                                                                    
                                                | Package / Case | 40-DIP (0.600", 15.24mm) | 
                                                                                    
                                                | Supplier Device Package | 40-PDIL | 
                                                                                    
                                                | Base Product Number | SST89E54RDA | 
                                                                                    
                                                | RoHS Status | ROHS3 Compliant | 
                                                                                    
                                                | Moisture Sensitivity Level (MSL) | Not Applicable | 
                                                                                    
                                                | REACH Status | REACH Unaffected | 
                                                                                    
                                                | ECCN | 3A991A2 | 
                                                                                    
                                                | HTSUS | 8542.31.0001 | 
                                                                                    
                                                | Standard Package | 10 | 
                                                                                                                
                                
                             
                                                8051 FlashFlex® Microcontroller IC 8-Bit 40MHz 24KB (24K x 8) FLASH 40-PDIL