DS1685

www.DataSheet4U.com DS1685/DS1687 3V/5V Real-Time Clocks www.maxim-ic.com FEATURES Incorporates Industry-Standard DS1287 PC Clock plus Enhanced Features Such as: § Y2K Compliant § +3V or +5V Operation § 64-Bit Silicon Serial Number § Power-Control Circuitry Supports System PowerOn from Date/Time Alarm or Key Closure § 32kHz Output for Power Management § Crystal-Select Bit Allows RTC to Operate with 6pF or 12.5pF Crystal § SMI Recovery Stack § 242 Bytes Battery-Backed NV RAM § Auxiliary Battery Input § § § § § § § RAM Clear Input Century Register Date Alarm Register Compatible with Existing BIOS for Original DS1287 Functions Available as Chip (DS1685) or Stand-Alone Encapsulated DIP (EDIP) with Embedded Battery and Crystal (DS1687) Timekeeping Algorithm Includes Leap-Year Compensation Valid Through 2099 Underwriters Laboratory (UL) Recognized APPLICATIONS Embedded Systems Utility Meters Security Systems Network Hubs, Bridges, and Routers PACKAGE DIMENSION INFORMATION www.maxim-ic.com/DallasPackInfo PIN CONFIGURATIONS TOP VIEW PWR X1 X2 AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 GND 1 2 3 24 23 VCC X2 X1 PWR N.C. VCC SQW PWR 1 2 3 4 5 6 7 8 9 10 11 12 24 VCC SQW VBAUX RCLR N.C. IRQ KS RD N.C. WR ALE CS DS1685/ DS1685S/ 22 4 DS1685E 21 5 6 7 8 9 10 11 12 20 19 18 17 16 15 14 13 VBAUX RCLR VBAT IRQ KS RD GND WR ALE CS AD0 AD1 AD2 AD3 AD4 AD5 N.C. 5 6 7 8 9 VBAUX SQW N.C. N.C. RCLR VBAT IRQ KS RD GND WR AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 GND DS1687 23 22 21 20 19 18 17 16 15 14 13 ...