P89C51X2BN P89C52X2BN 完全兼容AT89C51 AT89C52 AT89S51 AT89S52 8951 8952 . VIPER12A HA17358A HD74HC02P TC4066 TC4013 74HC164 74HC138 MAX813 MAX232 MAX485 MAX202 DS1302 DS1307 DS12C887 DS1210 W78E065 W78E052 ICL7107CPL PCF8563T/P AT24C02 THINK82C79