RoHS: yes. Maximum CPU clock frequency: 1.8 MHz/4 MHz/10 MHz. Number of I/O: 23. Program storage memory: 32 KByte. Program storage memory type: 'FLASH' memory. Storage memory capacity: 2 KByte/1 KByte. Storage memory type: SRAM/EEPROM. Digital peripheral circuits: WDT, RTC, PWM. Digital interface circuits: UART, SPI, I2C. Analog peripheral circuits: ADC, Comparator. Operating temperature range min (°C): -40°C. Operating temperature range max (°C): +85°C. Minimum supply voltage (V): +1.8V. Maximum supply voltage (V): +5.5V. Conditioning: plastic tube. Note: 23Prg. Number of terminals: 28. Assembly/installation: PCB through-hole mounting. Housing: PDIP. Housing (according to data sheet): PDIP-28P3. Operating temperature: -40...+85°C. VCC: 1.8...5.5V