DS1543WP-200,实时时钟
DS1553-100,IC RTC RAM Y2K 5V 100NS 28-EDIP
DS1553-100+,IC RTC RAM Y2K 5V 100NS 28-EDIP
DS1553-70,IC RTC RAM Y2K 5V 70NS 28-EDIP
DS1553-70+,IC RTC RAM Y2K 5V 70NS 28-EDIP
DS1553-85+,IC RTC RAM Y2K 5V 85NS 28-EDIP
DS1553P-100,实时时钟
DS1553P-100+,IC RTC RAM Y2K 5V 100NS 34-PCM
