Model:AT89S4051-24SUR BRAND:Microchip description:IC MCU 8BIT 4KB FLASH 20SOIC pack:tape(TR),Shear zone(CT),Digi-Reel? SERIES:89S status:in stock Core processor:8051 Core specifications:8-bit Speed:24MHz Peripherals:Undervoltage detection/reset,POR,PWM I/O number:15 Program storage capacity:4KB(4K x 8) Program memory type:Flash memory EEPROM capacity:- RAM size:256 x 8 Voltage - powered by:2.7V ~ 5.5V Data converter:- Oscillator type:bosom Operating temperature:-40°C ~ 85°C(TA) Type of installation:Surface mount type Encapsulation/Shell:20-SOIC(0.295",7.50mm width) Supplier device packaging:20-SOIC