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DS1693
DS1689/DS1693 3-Volt/5-Volt Serialized Real Time Clock with NV RAM Control www.dalsemi.com FEATURES PIN ASSIGNMENT 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 ORDERING INFORMATION PART # DS1689S DS1689SN DS1693 DESCRIPTION RTC IC, 28-pin SOIC RTC IC, 28-pin SOK IND RTC Module; 28-pin DIP 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 SOIC (740-mil) (330-mil) PIN DESCRIPTION X1 X2 RCLR AD0-AD7 PWR KS CS ALE WR RD VCCO IRQ SQW VCCI GND VBAT VBAUX PSEL CEI CEO 1 of 32 - Crystal Input - Crystal Output - RAM Clear Input - Mux’ed Address/Data Bus - Power-on Interrupt Output (Open drain) - Kickstart Input - RTC Chip Select Input - RTC Address Strobe - RTC Write Data Strobe - RTC Read Data Strobe - RAM Power Supply Output - Interrupt Request Output (Open drain) - Square Wave Output - +3- or +5V Main Supply - Ground - Battery + Supply - Auxiliary Battery Supply - +3- or +5V Power Select - RAM Chip Enable In - RAM Chip Enable Out 092800
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