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DS12887A

Name: DS12887A
Rating: 4.7 (12 reviews)

IC RTC CLK/CALENDAR PAR 24EDIP

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仕様

Part Status	Obsolete
DigiKey Programmable	Not Verified
Type	Clock/Calendar
Features	Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
Memory Size	114B
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Interface	Parallel
Voltage - Supply	4.5V ~ 5.5V
Voltage - Supply, Battery	2.5V ~ 4V
Current - Timekeeping (Max)	15mA @ 4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	24-DIP Module (0.600", 15.24mm)
Supplier Device Package	24-EDIP
Base Product Number	DS12887

概要

Description

The DS12887A is a real-time clock (RTC) chip developed by Dallas Semiconductor, primarily used to keep track of the current time and date in computer systems. It features a 3.0V to 5.5V power supply range and communicates over an I2C-compatible interface. The chip includes a battery backup feature, allowing it to maintain accurate time even during power outages.
Key functionalities include timekeeping with seconds, minutes, hours, day, date, month, and year, along with leap year support. The DS12887A also provides alarm functions, periodic interrupts, and a programmable square wave output for synchronization purposes.
This RTC is commonly found in embedded systems, personal computers, and various electronic devices that require accurate timekeeping without continuous power supply. Its robustness and low power consumption make it suitable for battery-operated devices.

Features

The DS12887A is a real-time clock (RTC) and CMOS RAM device designed for use in computer systems and embedded applications. Key features include:
1. Real-Time Clock: Provides accurate timekeeping with a programmable timekeeping interval (1 second to 1 minute).
2. Built-in Calendar: Tracks year, month, day, day of the week, hour, minute, and second.
3. Power Management: Operates on a low supply voltage (3V to 5.5V) with minimal power consumption, extending battery life.
4. CMOS RAM: Contains 256 bytes of non-volatile RAM for storing data even when powered off.
5. Compatibility: Designed to be compatible with Intel 80xx and 80C86/88 microprocessors, making it suitable for a range of applications.
6. Interrupts: Capable of generating interrupts for alarm functions.
7. Battery Backup: Supports a backup battery to maintain time and RAM data during power outages.
These features make the DS12887A ideal for personal computers, embedded systems, and other applications requiring reliable timekeeping and data storage.

Package

The DS12887A is typically packaged in a 28-pin DIP (Dual In-line Package) format. It may also be available in other package types like surface mount configurations, depending on the manufacturer.

Pinout

The DS12887A is a real-time clock (RTC) integrated circuit with a total of 28 pins. Its primary functions include timekeeping and providing a battery backup to maintain time when the main power is off. The key functionalities and pin assignments include:
1. Power Supply Pins: VCC (pin 1) and Ground (pin 28).
2. Timekeeping: The RTC tracks hours, minutes, seconds, and date with registers accessible via an I/O interface.
3. Control Pins: Include Interrupt pin (IRQ), Square Wave output, and Chip Select pins for communication.
4. Data Interface: Used for reading and writing time and control registers.
5. Battery Backup: Maintains time when external power is lost.
The device communicates over a multiplexed address/data bus, allowing it to interface with microcontrollers and other devices. It supports both binary and BCD formats for time representation.

Manufacturer

The DS12887A is manufactured by Maxim Integrated, which is a semiconductor company. Founded in 1983 and headquartered in San Jose, California, Maxim Integrated specializes in designing and producing analog and mixed-signal integrated circuits (ICs) for various applications, including communications, automotive, consumer electronics, and industrial systems. In 2021, Maxim Integrated was acquired by Analog Devices, Inc., expanding its portfolio and expertise in the analog and digital semiconductor market. The DS12887A is a real-time clock (RTC) chip used to keep track of time in computer systems and embedded applications.

Application

The DS12887A is a real-time clock (RTC) used in embedded systems for timekeeping applications. Its primary areas include personal computers, servers, and workstations for maintaining system time during power loss. It is also utilized in industrial control systems, telecommunications equipment, and networking devices for time-stamping events and scheduling tasks. Additionally, it's found in portable devices, medical equipment, and home automation systems, where accurate timekeeping is essential for operation and data logging.

Equivalent

The DS12887A is a real-time clock (RTC) chip. Equivalent products include the DS12887, DS12885, and MC146818. Other compatible options may include the NXP PCF8563 and the Maxim Integrated MAX6900 series, depending on specific application requirements. Always verify pin compatibility and functionality for your specific use case.