DS1644P-120,IC RAM TIMEKEEP NV 120NS 34-PCM
DS1644P-120+,IC RAM TIMEKEEP NV 120NS 34-PCM
DS1646-120,实时时钟
DS1646-120+,IC RAM TIMEKEEP NV 120NS 32-EDIP
DS1646H-120,实时时钟
DS1646P-120,实时时钟
DS1646P-120+,IC RAM TIMEKEEP NV 120NS 34-PCM
DS1647-120,实时时钟
