Atmel, acquired by Microchip in 2016, originally developed the ATtiny family of MCUs. Microchip now offers ATtiny MCUs.
The tinyAVR® Microcontrollers family is optimized for applications that require performance, power efficiency and ease of use. Integrated ADC, EEPROM memory and brown-out detector lets you build applications without adding external components. ATtiny MCUs offer flash memory and on-chip debug for fast, secure and cost-effective in-circuit upgrades that significantly cut your time to market.