DS17485/DS17487 3V/5V Real-Time Clock www.
maxim-ic.
com FEATURES Incorporates industry standard DS1287 PC clock plus enhanced features: § Y2K compliant § +3V or +5V operation § SMI recovery stack § 64-bit silicon serial number § Power-control circuitry supports system power-on from date/time alarm or key closure § 32kHz output on power-up § Crystal select bit allows RTC to operate with 6pF or 12.
5pF crystal § 114 bytes user NV RAM § Auxiliary battery input § 4kB additional NV RAM § RAM clear input § Century register § Date alarm register § Compatible with existing BIOS for original DS1287 functions § Available as chip (DS17485) or standalone module with embedded battery and crystal (DS17487)...

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