Microchip Technology SST89E54RD-33-C-PIE Core: 8051 Data Bus Width: 8 bit Data Ram Size: 1 KB Data Rom Size: 128 B Interface Type: SPI, UART Maximum Clock Frequency: 33 MHz Maximum Operating Temperature: + 70 C Minimum Operating Temperature: 0 C Mounting Style: Through Hole Number Of Programmable I/os: 32 Number Of Timers: 3 Operating Supply Voltage: 2.7 V to 3.6 V Package / Case: PDIP-40 Processor Series: FlashFlex Program Memory Size: 16 KB Program Memory Type: EEPROM Rohs: yes Supply Voltage - Max: 3.6 V Supply Voltage - Min: 2.7 V RoHS: yes Data RAM Size: 1 KB On-Chip ADC: No Data ROM Size: 128 B Number of Programmable I/Os: 32 Number of Timers: 3