Product Summary
The DS12C887 is a Real-Time Clock. It 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 DS12C887integrates a quartz crystal and lithium energy source into a 24-pin encapsulated DIP package. The DS12C887 adds a century byte at address 32h. Applications 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 EDIP: -40℃ to +85℃; (5)Storage Temperature range PDIP, SO, PLCC, TQFP: -55℃ to +125℃.
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 Through 2099; (3)Binary or BCD Time Representation; (4)12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode; (5)Daylight Saving Time Option; (6)Selectable Intel or Motorola Bus Timing; (7)Interfaced with Software as 128 RAM Locations; (8)14 Bytes of Clock and Control Registers; (9)Interrupt Output with Three Independently Maskable Interrupt Flags; (10)Time-of-Day Alarm Once Per Second to Once Per Day; (11)Periodic Rates from 122μs to 500ms; (12)End-of-Clock Update Cycle Flag; (13)Programmable Square-Wave Output; (14)Automatic Power-Fail Detect and Switch Circuitry.
Diagrams
Image | Part No | Mfg | Description | Pricing (USD) |
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DS12C887 |
Maxim Integrated Products |
Real Time Clock |
Data Sheet |
Negotiable |
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DS12C887+ |
Maxim Integrated Products |
Real Time Clock RTC |
Data Sheet |
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DS12C887A |
Maxim Integrated Products |
Real Time Clock |
Data Sheet |
Negotiable |
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DS12C887A+ |
Maxim Integrated Products |
Real Time Clock RTC |
Data Sheet |
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