MC146818A

MC146818A is a real-time clock chip used for timekeeping in computer systems.
7,870 有效庫存

MC146818A

有效庫存7,870

MC146818A is a real-time clock chip used for timekeeping in computer systems.

  • 製造商零件號 # : MC146818A

  • 包裝/封裝: PLCC28

  • 製造商: MOTOROLA

  • 產品分類 : Timers or RTCs

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MC146818A 數據表
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詳細說明

The MC146818A is a real-time clock (RTC) and calendar chip that is commonly used in computer systems to keep track of time and date. It is a 24-pin IC that communicates with the system through a simple interface. The MC146818A features a programmable alarm, periodic interrupt functions, and battery backup to ensure accurate timekeeping even when the computer is turned off.The chip operates on a 32.768 kHz crystal oscillator and has a precision timekeeping capability with an accuracy of ±1 minute per month. It can be used to generate interrupts at regular intervals for scheduling tasks in a computer system. The MC146818A also has a battery backup feature that allows it to retain time and date information in case of power loss.Programming the MC146818A involves setting registers to configure the alarm, periodic interrupt, and other functions. The chip has a set of control registers that allow the user to read and write time and date information, as well as configure the various features of the RTC.

主要特徵

  • Real-time clock (RTC) module
  • Provides time-keeping, alarm, and timer functions
  • Contains 114 bytes of NVRAM for data storage
  • Supports 24-hour format and leap year compensation
  • Operates at low power consumption
  • Requires a 32.768 kHz crystal oscillator
  • Available in a 24-pin DIP package

應用

  • Real-time clock for computer systems
  • Timekeeping in embedded systems
  • Timestamping data in communication systems
  • Providing time-of-day information in electronic devices
  • Ensuring accurate timing in industrial automation
  • Monitoring and controlling time-based processes
  • Synchronizing devices in distributed systems
  • Time-stamping data in scientific instruments
  • Time-based operations in automotive systems
  • Clock functions in consumer electronics devices
MOTOROLA Inventory

規格

以下是所選零件的基本參數，涉及零件的特性及其所屬類別。

Manufacturer Motorola Product Category ! IC Chips

數據表 PDF

數據表記錄了器件的特性、絕對最大額定值、應用等，這對於作為器件特定應用的整體指南大有裨益。

初步規格 MC146818A PDF 下載

常見問題解答

What is MC146818A?

The MC146818A is a real-time clock (RTC) and calendar chip designed by Motorola. It provides timekeeping functions and a calendar with alarm capabilities, making it suitable for applications requiring accurate timekeeping and date tracking.

How Does MC146818A Work?

The MC146818A operates by keeping track of time and date information using an internal counter and registers. It features a crystal oscillator circuit for accurate timekeeping, along with battery backup support to maintain time during power interruptions. The chip can be interfaced with a microcontroller or computer system for time-related functions.

How Many Pins does MC146818A have and What are the Functions of the Pinout Configuration?

The MC146818A typically comes in a 24-pin DIP (Dual Inline Package) or SOP (Small Outline Package). The pinout configuration includes:

  • VCC: Power supply pin.
  • GND: Ground pin.
  • X1, X2: Crystal oscillator input and output pins.
  • IRQ: Interrupt request output pin.
  • AD0-AD7: Address/data pins for communication with the chip.
  • CS, RD, WR: Control pins for chip select, read, and write operations.
  • RESET: Reset pin for initialization.

What are the Pros and Cons of MC146818A?

Pros:

  • Accurate Timekeeping: Provides precise clock and calendar functions for time-sensitive applications.
  • Battery Backup: Maintains timekeeping during power outages or system shutdowns.
  • Alarm Functionality: Supports alarm features for event scheduling.
  • Easy Integration: Can be interfaced with microcontrollers or systems using standard communication protocols.
  • Reliable Performance: Offers reliable operation for long-term timekeeping needs.

Cons:

  • Legacy Technology: The MC146818A may have limitations compared to modern RTC solutions.
  • Limited Features: Some advanced timekeeping features found in newer RTC chips may be lacking.
  • Package Size: The 24-pin DIP or SOP package may require more PCB space compared to smaller packages.

Are There Any Equivalents/Alternatives to MC146818A for Recommendation?

  • The DS12887 from Maxim Integrated is a compatible alternative to the MC146818A.
  • Alternatives to the MC146818A include the PCF8583 from NXP Semiconductors and the DS3231 from Maxim Integrated.

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