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DS1689 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS1689 Datasheet(HTML) 1 Page - Dallas Semiconductor |
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1 / 32 page  1 of 32 092800 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 ORDERING INFORMATION PART # DESCRIPTION DS1689S RTC IC, 28-pin SOIC DS1689SN RTC IC, 28-pin SOIC IND DS1693 RTC Module; 28-pin DIP PIN ASSIGNMENT PIN DESCRIPTION X1 - Crystal Input X2 - Crystal Output RCLR - RAM Clear Input AD0-AD7 - Mux’ed Address/Data Bus PWR - Power-on Interrupt Output (Open drain) KS - Kickstart Input CS - RTC Chip Select Input ALE - RTC Address Strobe WR - RTC Write Data Strobe RD - RTC Read Data Strobe VCCO - RAM Power Supply Output IRQ - Interrupt Request Output (Open drain) SQW - Square Wave Output VCCI - +3- or +5V Main Supply GND - Ground VBAT - Battery + Supply VBAUX - Auxiliary Battery Supply PSEL - +3- or +5V Power Select CEI - RAM Chip Enable In CEO - RAM Chip Enable Out DS1689/DS1693 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control www.maxim-ic.com VBAUX DS1689S 28-Pin SOIC (330-mil) 13 27 1 2 3 4 5 6 7 8 9 10 11 12 14 28 26 25 24 23 22 21 20 19 18 17 15 16 CEI VCCO SQW VBAT IRQ PSEL RD GND WR ALE KS CS CEO VCCI X2 AD0 AD2 AD3 AD4 AD5 AD6 AD7 GND PWR X1 RCLR AD1 GND DS1693 28-Pin Encapsulated Package (740-mil) 13 27 NC AD0 AD2 AD3 AD4 AD5 AD6 AD7 GND PWR CEI VCCO SQW NC IRQ PSEL RD NC WR ALE KS CS 1 2 3 4 5 6 7 8 9 10 11 12 14 28 26 25 24 23 22 21 20 19 18 17 15 16 NC RCLR AD1 VBAUX CEO VCCI |
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