The ATtiny404 is a microcontroller using the 8-bit AVR® processor with hardware multiplier, running at up to 20MHz and 4KB Flash, 256B SRAM and 128 bytes of EEPROM in a 14-pin package. The series uses the latest technologies from Microchip with a flexible and low power architecture including Event System and SleepWalking, accurate analog features and advanced peripherals.

8-bit high-performance AVR RISC CPU
135 instructions
Hardware multiplier
Ultra Low Power (ULP)
Three sleep modes:
Idle
Standby
Power Down
6 Channels Event System
Configurable Custom Logic (CCL)
12 Channel 10-bit ADC with Voltage Reference
Comparators
2x 16-bit Timer (TCA / TCB)
Cyclical Redundancy Check (CRC/SCAN)
Watchdog Timer (WDT)
Power-On Reset (POR)
Brown-Out Detection (BOD)
Single pin programming and debugging interface (UPDI)
Operation Voltage: 1.8V – 5.5V