![]() (*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. (**) Displayed Buy Now Price and Price Range is based on small quantity orders. See our Ordering FAQs for answers to questions about online orders, payment options and more. The device is accessed through a multiplexed byte-wide interface, which supports both Intel and Motorola modes. A lithium coin-cell battery can be connected to the V BAT input pin on the DS12885 to maintain time and date operation when primary power is absent. If a primary power failure is detected, the device automatically switches to a backup supply. A precision temperature-compensated circuit monitors the status of V CC. The devices also operate in either 24-hour or 12-hour format with an AM/PM indicator. For all devices, the date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. The DS12C887 adds a century byte at address 32h. The DS12887 integrates a quartz crystal and lithium energy source into a 24-pin encapsulated DIP package. The devices provide a real-time clock/calendar, one time-of-day alarm, three maskable interrupts with a common interrupt output, a programmable square wave, and 114 bytes of battery-backed static RAM (113 bytes in the DS12C887 and DS12C887A). The DS12885, DS12887, and DS12C887 real-time clocks (RTCs) are designed to be direct replacements for the DS1285 and DS1287. Optional Industrial Temperature Range Available.Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS12887, DS12887A, DS12C887, DS12C887A).Optional 28-Pin PLCC Surface Mount Package or 32-Pin TQFP (DS12885).Automatic Power-Fail Detect and Switch Circuitry.Time-of-Day Alarm Once Per Second to Once Per Day.Interrupt Output with Three Independently Maskable Interrupt Flags.114 Bytes of General-Purpose, Battery-Backed RAM (113 Bytes in the DS12C887 and DS12C887A).14 Bytes of Clock and Control Registers.Interfaced with Software as 128 RAM Locations.Selectable Intel or Motorola Bus Timing. ![]() 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode.RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099.Drop-In Replacement for IBM AT Computer Clock/Calendar. ![]()
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