DS1643P-100,实时时钟
DS1643P-100+,IC RAM TIMEKEEP NV 100NS 34-PCM
DS1643P-70,IC RAM TIMEKEEP NV 70NS 34-PCM
DS1643P-70+,IC RAM TIMEKEEP NV 70NS 34-PCM
DS1643P-85+,IC RAM TIMEKEEP NV 85NS 34-PCM
DS1644-120,IC RAM TIMEKEEP NV 120NS 28-EDIP
DS1644-120+,IC RAM TIMEKEEP NV 120NS 28-EDIP
DS1644L-120,实时时钟
