Description
The DS12C887+ is a high-performance Real-Time Clock (RTC) designed as a direct, drop-in replacement for the industry-standard DS1285 and IBM AT computer clock/calendar. Housed in a robust 24-pin EDIP package, this device provides a comprehensive suite of timing functions, including a calendar, one daily alarm, three maskable interrupts with a common output, and a programmable square-wave output.
Beyond its clock functionality, the DS12C887+ features 113 bytes of battery-backed static RAM, allowing for persistent data storage. It offers advanced features such as automatic leap-year compensation (up to 2099), a century byte, and selectable 12/24-hour formats. To ensure reliability, an onboard precision temperature-compensated circuit monitors VCC, automatically switching to a backup supply during power failures. This makes the DS12C887+ an essential component for mission-critical applications like utility meters, network infrastructure, and robust embedded systems.
Key Features
- Full Calendar Functionality: Tracks seconds, minutes, hours, day, date, month, and year with automatic leap-year compensation through 2099.
- Integrated Reliability: Automatic power-fail detection and switch-over to a backup supply ensure continuous operation.
- Flexible Bus Timing: Selectable Intel or Motorola bus timing for easy integration into various architectures.
- Advanced Timing Tools: Features a daily alarm, three maskable interrupts, a programmable square-wave output, and daylight saving time support.
- Massive Memory: 113 bytes of battery-backed static RAM for user-defined persistent data.
- Standardized Interface: Interfaced with software as 128 distinct RAM locations using a multiplexed bus.
Applications
- Embedded Systems: Reliable clock source for industrial and custom embedded hardware.
- Network Infrastructure: Essential for timing in network hubs, bridges, and routers.
- Utility Metering: High-precision time-stamping for energy, water, and gas monitoring systems.
- Legacy Systems: Ideal drop-in replacement for IBM AT-compatible clock/calendar requirements.
Package Includes
- 1 x DS12C887+ Alarm RTC IC (EDIP-24)
Technical Specifications
| Parameter | Specification |
|---|---|
| Device | DS12C887+ |
| Clock/Date Format | HH:MM:SS / Day; Date; Month; Year |
| Interface | Multiplexed Bus |
| Supply Voltage | 4.5V – 5.5V |
| Package Type | EDIP-24 |
| Operating Temp | 0°C to +70°C |
| Shipping Weight | 0.002 kg |
| Shipping Dimensions | 9 × 7 × 2 cm |
Note: Product images are shown for illustrative purposes only and may differ from the actual product. For complete technical parameters, please refer to the official device datasheet.
