DS12C887

Product Summary

The DS12C887 real-time clock(RTC) is designed to be direct replacements for the DS1287. The device provides 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 batterybacked static RAM (113 bytes in the DS12C887). The DS12C887 adds a century byte at address 32h. 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. Applications of the DS12C887 include: Embedded Systems, Utility Meters, Security Systems, Network Hubs, Bridges, and Routers.

Parametrics

DS12C887 absolute maximum ratings: (1)Voltage Range on VCC Pin Relative to Ground: -0.3V to +6.0V; (2)Operating Temperature Range, Commercial (noncondensing): 0℃ to +70℃; (3)Operating Temperature Range, Industrial (noncondensing): -40℃ to +85℃; (4)Storage Temperature Range: -55℃ to +125℃; (5)Soldering Temperature (leads, 10s): +260℃.

Features

DS12C887 features: (1)Drop-In Replacement for IBM AT Computer Clock/Calendar; (2)RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation; (3)Through 2099; (4)Binary or BCD Time Representation; (5)12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode; (6)Daylight Saving Time Option; (7)Selectable Intel or Motorola Bus Timing; (8)Interfaced with Software as 128 RAM Locations; (9)14 Bytes of Clock and Control Registers; (10)114 Bytes of General-Purpose, Battery-Backed RAM (113 Bytes in the DS12C887); (11)RAM Clear Function (DS12885, DS12887A); (12)Interrupt Output with Three Independently Maskable Interrupt Flags; (13)Time-of-Day Alarm Once Per Second to Once Per Day; (14)Periodic Rates from 122μs to 500ms; (15)End-of-Clock Update Cycle Flag; (16)Programmable Square-Wave Output; (17)Automatic Power-Fail Detect and Switch Circuitry; (18)Optional 28-Pin PLCC Surface Mount Package; (19)Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery ; (20)Optional Industrial Temperature Range Available; (21)Underwriters Laboratory (UL) Recognized.

Diagrams