Hi Joe,

Do you mean the P89V51Rx2?

I say this for ages now: as far as I can judge, the P89V51RD2 is just a rebranded SST89E516RD (or RD2, the difference is marginal) with NXP-specific bootloader (i.e. there is no factory-installed bootloader in the SST-s).

The FLASH size in SST's designation is the last digit (or last two digits in case of the '516), in the original Intel's "x4 kB" style, i.e. the 'RC2 is equivalent to 'E58.

The low-voltage version in SST's is marked as 'V' instead of 'E', i.e. SST89V516RD2 is supposed to be the equivalent of P89LV51RD2.

Of course I give no guarantee for this claim: NXP is free to use any other source for their chips as long as they meet their specification.

Jan

PS: There may be other sources of more or less direct replacement for the 'Rx2's (with ISP inevitably differing significantly), e.g. Stefan Kanev reported good experience with Winbond's offerings on this Forum.