AT89C51RC2-SLSIL
AT89C51RC2-SLSIM
AT89C51RC2-SLSUL
AT89C51RC2-SLSUM
AT89C51RC2TIM
AT89C51RC2TUL
AT89C51RC2TUM
AT89C51RC2-UM
AT89C51RC-33AC
AT89C51RC-33JC