Model:AT89C55WD-24AC BRAND:Microchip description:IC MCU 8BIT 20KB FLASH 44TQFP pack:tray SERIES:89C status:Discontinued Core processor:8051 Core specifications:8-bit Speed:24MHz Peripherals:WDT I/O number:32 Program storage capacity:20KB(20K x 8) Program memory type:Flash memory EEPROM capacity:- RAM size:256 x 8 Voltage - powered by:4.5V ~ 5.5V Data converter:- Oscillator type:bosom Operating temperature:0°C ~ 70°C(TA) Type of installation:Surface mount type Encapsulation/Shell:44-TQFP Supplier device packaging:44-TQFP(10x10)