Microchip Technology SST89E554RC-40-C-PI Core: 8051 Data Bus Width: 8 bit Data Ram Size: 1 KB Data Rom Size: 128 B Interface Type: SPI, UART Maximum Clock Frequency: 40 MHz Maximum Operating Temperature: + 70 C Minimum Operating Temperature: 0 C Mounting Style: Through Hole Number Of Programmable I/os: 32 Number Of Timers: 16 bit On-chip Adc: No On-chip Dac: No Operating Supply Voltage: 4.5 V to 5.5 V Package / Case: PDIP-40 Processor Series: FlashFlex Program Memory Size: 32 KB Program Memory Type: Flash Supply Voltage - Max: 5.5 V Supply Voltage - Min: 4.5 V Data RAM Size: 1 KB On-Chip ADC: No Data ROM Size: 128 B Number of Programmable I/Os: 32 Number of Timers: 16 bit On-Chip DAC: No