Overview
The DS12C887+ is a real-time clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. This component is designed as a direct replacement for the DS1285 and DS12887 in existing IBM-compatible personal computers. It provides a comprehensive clock and calendar function, keeping track of time even when the primary power supply is off. The device features a wide operating voltage range of 4.5V to 5.5V and is supplied in a 24-pin EDIP package that meets RoHS standards.
Key Specifications
| Parameter | Value |
|---|---|
| Package | EDIP-24 |
| Supply Voltage Range | 4.5V to 5.5V |
| Operating Temperature Range | 0°C to 70°C |
| Current Draw | 15mA @ 4.5V ~ 5.5V |
| Time Keeping | Seconds, minutes, hours, day, date, month, and year with leap year compensation through 2099 |
| Time Representation | Binary or BCD |
| Alarm Function | Time of day alarm once per second to once per day |
| Interrupts | Three maskable interrupts with a common interrupt output |
| RAM | 113 bytes of battery-backed static RAM |
| Bus Timing | Selectable Intel or Motorola bus timing |
Key Features
- Comprehensive Clock and Calendar: Keeps track of seconds, minutes, hours, day, date, month, and year with leap year compensation through 2099.
- Time Representation: Supports both binary and BCD time representation.
- Alarm Function: Features a time of day alarm that can be set to trigger once per second to once per day.
- Interrupts: Includes three maskable interrupts with a common interrupt output.
- Programmable Square-Wave Output: Allows for customizable square-wave output.
- Battery-Backed RAM: Provides 113 bytes of battery-backed static RAM.
- Selectable Bus Timing: Supports both Intel and Motorola bus timing.
- Automatic Power Switching: Automatically switches to a backup supply in case of primary power failure.
Applications
- Embedded Systems: Ideal for use in various embedded systems where accurate timekeeping is essential.
- Utility Meters: Used in utility meters for precise time and date tracking.
- Network Hubs, Bridges, and Routers: Suitable for network devices that require reliable timekeeping.
- Smart Home Automation and Control Systems: Can be used in smart home systems that require secure communication and data transmission.
Q & A
- Q: What is the operating voltage range of the DS12C887+?
A: The operating voltage range is 4.5V to 5.5V. - Q: What is the operating temperature range of the DS12C887+?
A: The operating temperature range is from 0°C to 70°C. - Q: Does the DS12C887+ support both binary and BCD time representation?
A: Yes, it supports both binary and BCD time representation. - Q: What type of interrupts does the DS12C887+ have?
A: It has three maskable interrupts with a common interrupt output. - Q: How much battery-backed RAM does the DS12C887+ provide?
A: It provides 113 bytes of battery-backed static RAM. - Q: Can the DS12C887+ automatically switch to a backup power supply?
A: Yes, it automatically switches to a backup supply in case of primary power failure. - Q: What is the current draw of the DS12C887+ at 4.5V to 5.5V?
A: The current draw is 15mA at 4.5V to 5.5V. - Q: Is the DS12C887+ RoHS compliant?
A: Yes, it is RoHS compliant. - Q: What type of package does the DS12C887+ come in?
A: It comes in a 24-pin EDIP package. - Q: Can the DS12C887+ be used in smart home automation systems?
A: Yes, it can be used in smart home automation systems that require secure communication and data transmission.
