The PIC12C509AT-04I/SN from MICROCHIP TECH. is PIC 12C family 8-Pin SOIC 8-Bit CMOS microcontroller. The PIC12C509AT-04I/SN microcontroller has 1.5KB (1K x 12) OTP program memory, 41 x 8 RAM size and 5 I/O general-purpose I/O pins. This microcontroller operates at a maximum frequency of 4MHz with wide operating voltage of 3 to 5.5V. Operating temperature range is from -40°C to 85°C.