DS12885TN+,IC RTC W/RAM 128 BYTE 32-TQFP
DS12887,IC RTC W/RAM 128 BYTE 24-EDIP
DS12887+,IC RTC W/RAM 128 BYTE 24-EDIP
DS12887A,IC RTC W/RAM 128 BYTE 24-EDIP
DS12887A+,IC RTC W/RAM 128 BYTE 24-EDIP
DS1290,计数器移位寄存器
DS12C887,IC RTC W/RAM 128 BYTE 24-EDIP
DS12C887+,IC RTC W/RAM 128 BYTE 24-EDIP