Philips Semiconductors P89C668HBBD/00,557 Core: 80C51 Data Bus Width: 8 bit Maximum Clock Frequency: 33 MHz Program Memory Size: 64 KB Data RAM Size: 8 KB On-Chip ADC: No Operating Supply Voltage: 5 V Maximum Operating Temperature: + 70 C Package / Case: LQFP Mounting Style: SMD/SMT Interface Type: I2C, UART Minimum Operating Temperature: 0 C Number of Programmable I/Os: 32 Number of Timers: 3 Processor Series: P89C668x Program Memory Type: Flash Factory Pack Quantity: 800 Supply Voltage - Max: 5.5 V Supply Voltage - Min: 4.5 V