Microchip AT89C51AC2-SLSUM, 8bit 80C51 Microcontroller, Microcontrollers, 20MHz, 8 kB Flash, 44-Pin PLCC

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The Microchip AT89S51 is a low-power and high performance CMOS 8-bit microcontroller with 4K bytes of in system programmable flash memory the on-chip flash allows the program memory to be reprogrammed in system or by a conventional non-volatile memory programmer.

Compatible with MCS®-51 products
4K bytes of in system programmable (ISP) flash memory
4.0V to 5.5V operating range
Fully static operation: 0 Hz to 33 MHz
Three level program memory lock
128 x 8-bit internal RAM
32 programmable I/O lines