Overview
The DS12C887A+ is a real-time clock (RTC) and calendar IC produced by Analog Devices Inc./Maxim Integrated. This device is designed as a direct replacement for the DS1285 and DS1287, offering enhanced features and reliability. It provides a comprehensive timekeeping solution with a real-time clock/calendar, time-of-day alarm, and additional memory for general-purpose use. The DS12C887A+ is particularly useful in applications requiring precise timekeeping and data storage, even in the absence of primary power due to its battery-backed static RAM.
Key Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Part Number | DS12C887A+ |
| Package Type | 24-EDIP (Encapsulated Dual-In-Line Module) |
| Operating Temperature | 0°C to 70°C |
| Supply Voltage | 4.5V to 5.5V (primary), 2.5V to 4V (battery) |
| Time Format | HH:MM:SS (12/24 hour), YY-MM-DD-dd |
| Memory Size | 113 bytes of battery-backed static RAM |
| Interface | Parallel, supports Intel and Motorola bus timing |
| Current - Timekeeping (Max) | 15mA @ 4.5V to 5.5V |
| Features | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output |
Key Features
- Real-time clock/calendar with seconds, minutes, hours, day, date, month, and year, including leap year compensation through 2099.
- Binary or BCD time representation and 12-hour or 24-hour clock with AM/PM indicator in 12-hour mode.
- Daylight Saving Time option and programmable square-wave output.
- Three independently maskable interrupt flags and one time-of-day alarm.
- Automatic power-fail detect and switch circuitry to a backup supply.
- 114 bytes of battery-backed static RAM (113 bytes in the DS12C887A).
- Supports both Intel and Motorola bus timing.
- Optional industrial temperature range available.
Applications
- Embedded Systems
- Network Hubs, Bridges, and Routers
- Security Systems
- Utility Meters
Q & A
- What is the primary function of the DS12C887A+?
The DS12C887A+ is a real-time clock (RTC) and calendar IC that provides precise timekeeping and calendar functions.
- What are the supported time formats?
The device supports both 12-hour and 24-hour formats with AM/PM indicators in 12-hour mode.
- How does the device handle power failures?
The device automatically switches to a backup supply, such as a lithium coin-cell battery, in case of a primary power failure.
- What is the memory capacity of the DS12C887A+?
The device has 113 bytes of battery-backed static RAM.
- Does the DS12C887A+ support daylight saving time adjustments?
- What are the common applications of the DS12C887A+?
- What is the operating temperature range of the DS12C887A+?
- Does the DS12C887A+ have any interrupt features?
- Is the DS12C887A+ RoHS compliant?
- What is the maximum current consumption for timekeeping?
