BUY KT3170 https://www.utsource.net/itm/p/122318.html
Low Power DTMF Receiver
The KT3170 is a CMOS 8-bit microcontroller manufactured by Samsung Semiconductor. It is a low-cost, low-power device with a wide range of features and applications. The KT3170 is designed to be used in a variety of applications, including automotive, industrial, and consumer applications. It features a wide range of peripherals, including a 16-bit timer, a watchdog timer, an 8-bit A/D converter, and an 8-bit D/A converter. It also has a variety of communication interfaces, including a serial port, an I2C bus, and a CAN bus. The KT3170 is packaged in a DIP-18 package and is available in a variety of speeds, from 8 MHz to 40 MHz. It is also available in a variety of temperature ranges, from -40°C to +85°C. (For reference only)