DS1553P-100,实时时钟
DS1553P-100+,IC RTC RAM Y2K 5V 100NS 34-PCM
DS1553P-70,IC RTC RAM Y2K 5V 70NS 34-PCM
DS1553P-70+,IC RTC RAM Y2K 5V 70NS 34-PCM
DS1553P-85+,IC RTC RAM Y2K 5V 85NS 34-PCM
DS1553W-120,实时时钟
DS1553W-120+,IC RTC RAM Y2K 3.3V 120NS 28EDIP
DS1553W-150,实时时钟