AT89S53-24JC .

Description: IC MCU 8BIT 12KB FLASH 44PLCC, Number of I/O: 32, Supplier Device Package: 44-PLCC (16.6x16.6), Peripherals: WDT, Connectivity: SPI, UART/USART, Voltage - Supply (Vcc/Vdd): 4V ~ 6V, Core Size: 8-Bit, Core Processor: 8051, Program Memory Type: FLASH, Oscillator Type: Internal, Operating Temperature: 0°C ~ 70°C (TA), RAM Size: 256 x 8, Program Memory Size: 12KB (12K x 8), Speed: 24MHz, Mounting Type: Surface Mount, Package / Case: 44-LCC (J-Lead), Packaging: Tube, DigiKey Programmable: Not Verified.