DS1693

www.DataSheet4U.com DS1689/DS1693 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control www.maxim-ic.com FEATURES Incorporates industry standard DS1287 PC clock plus enhanced features: § +3- or +5V operation § 64-bit silicon serial number § 64-bit customer specific ROM or additional serial number available § Power control circuitry supports system power-on from date/time alarm or key closure § Automatic battery backup and write protection to external SRAM § Crystal select bit allows RTC to operate with 6 pF or 12.5 pF crystal § 114 bytes user NV RAM § Auxiliary battery input § RAM clear input § Century register § 32 kHz output for power management § 32-bit VCC powered elapsed time counter § 32-bit VBAT powered elapsed time counter § 16-bit power cycle counter § Compatible with existing BIOS for original DS1287 functions § Available as IC (DS1689) or standalone module with embedded battery and crystal (DS1693) § IC is available in industrial temperature version § Timekeeping algorithm includes leap year compensation valid up to 2100 PIN ASSIGNMENT VBAUX NC NC RCLR AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 PWR GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 CEI CEO VCCI VCCO SQW NC IRQ PSEL RD NC WR ALE CS KS VBAUX X1 X2 RCLR AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 PWR GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 CEI CEO VCCI VCCO SQW VBAT IRQ PSEL RD GND WR ALE CS KS DS1693 28-Pin Encapsulated Package DS1689S 28-Pin SOI...