80C51 89C Microcontroller IC 8-Bit 40MHz 16KB (16K x 8) FLASH 28-PLCC (11.51x11.51)..
8051 87F Microcontroller IC 8-Bit 24MHz 4KB (4K x 8) OTP Quick FLASH 44-PLCC (16.6x16.6)..
80C51 AT89C513x Microcontroller IC 8-Bit 48MHz 32KB (32K x 8) FLASH 52-PLCC (19.15x19.15)..