DS1687-5IND,IC RTC 5V 64-BIT Y2K 24-EDIP
DS1687-5IND+,IC RTC 5V 64-BIT Y2K 24-EDIP
DS1688,IC RTC W/NV RAM CTRL 28-DIP
DS1688S,IC RTC W/NV RAM CTRL 28-SOIC
DS1688S+,IC RTC W/NV RAM CTRL 28-SOIC
DS1689,IC RTC SER W/NV RAM CTRL 28-DIP
DS1689S,IC RTC SER W/NV RAM CTRL 28-SOIC
DS1689S/T&R,实时时钟
