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MC146818AP
The MC146818AP is a real-time clock chip commonly used in computer systems to keep track of time and dateMC146818AP
The MC146818AP is a real-time clock chip commonly used in computer systems to keep track of time and date
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MC146818AP 數據表
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詳細說明
The MC146818AP is a Real Time Clock (RTC) chip designed by Motorola. It is commonly used in computer systems to keep track of time and date even when the system is powered off. The chip is also known as the CMOS clock chip and is widely used in older IBM compatible computers.The MC146818AP features a 24-hour clock with a century register and leap year compensation. It has a built-in oscillator circuit and is powered by a lithium cell battery to maintain accurate time keeping. The chip communicates with the system through an 8-bit data bus and can be easily programmed to set time and date parameters.The MC146818AP is a reliable and accurate RTC chip that has been widely used in computer systems for many years. While newer technologies have replaced it in modern computers, it still remains a popular choice for retro computer enthusiasts and hobbyists
主要特徵
- Used in real-time clock (RTC) applications
- 8-bit data bus interface
- Provides a time-keeping solution for your project
- Capable of generating interrupts
- Includes programmable periodic interrupt timer
- Internal automatic leap year compensation
- Operates in 24 or 12-hour format
應用
- Embedded Systems
- Real-time Clocks
- Communication Systems
- Navigation Systems
- Industrial Control Systems
- Automotive Electronics
- Medical Devices
- Security Systems
- Scientific Instruments
- Consumer Electronics
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。
| Rohs Code | No | Part Life Cycle Code | Obsolete |
| Reach Compliance Code | ECCN Code | EAR99 | |
| HTS Code ! | 8542.39.00.01 | Additional Feature ! | ALSO OPERATES AT 3V SUPPLY |
| Bus Compatibility | 8085; 8048; 8049; MC3870; MC6805; MC146805; S2000; 8021 | Clock Frequency-Max | 1 MHz |
| External Data Bus Width | 8 | Information Access Method | PARALLEL, MUXED BUS |
| JESD-30 Code | R-PDIP-T24 | JESD-609 Code | e0 |
| Length | 31.75 mm | Number of Terminals | 24 |
| Number of Timers | 1 | On Chip Data RAM Width | 8 |
| Operating Temperature-Max | 70 °C | Operating Temperature-Min | |
| Output Clock Frequency-Max | 0.032768 MHz | Package Body Material | PLASTIC/EPOXY |
| Package Code | DIP | Package Shape | RECTANGULAR |
| Package Style | IN-LINE | Qualification Status ! | Not Qualified |
| RAM (words) | 50 | Seated Height-Max | 5.08 mm |
| Supply Current-Max | 3 mA | Supply Voltage-Max | 6 V |
| Supply Voltage-Min | 3 V | Supply Voltage-Nom | 5 V |
| Surface Mount ! | NO | Technology | CMOS |
| Temperature Grade ! | COMMERCIAL | Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form ! | THROUGH-HOLE | Terminal Pitch ! | 2.54 mm |
| Terminal Position | DUAL | Width | 15.24 mm |
| uPs/uCs/Peripheral ICs Type | TIMER, REAL TIME CLOCK |
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。
常見問題解答
What is MC146818AP?
The MC146818AP is a real-time clock (RTC) and calendar chip designed by Motorola and later Freescale Semiconductor. It is commonly used in computer systems, embedded devices, and industrial applications to provide accurate timekeeping and calendar functions.
How Does MC146818AP Work?
The MC146818AP operates as a real-time clock and calendar by counting time in seconds, minutes, hours, days, months, and years. It utilizes a battery backup to maintain timekeeping even when the main power source is disconnected. The chip also features alarm functions, periodic interrupts, and programmable square wave output for system timing applications.
How Many Pins does MC146818AP have and What are the Functions of the Pinout Configuration?
The MC146818AP is housed in a 24-pin DIP (Dual Inline Package). The pinout configuration includes:
- VCC: Positive power supply pin.
- GND: Ground pin.
- IRQ: Interrupt request output pin.
- AD0-AD7: Address/data bus pins for interfacing with the microprocessor.
- CS: Chip select input pin.
- RESET: Reset input pin.
- IRQ: Interrupt request output pin.
- IRQ: Interrupt request output pin.
What are the Pros and Cons of MC146818AP?
Pros:
- Accurate Timekeeping: Provides reliable real-time clock and calendar functions.
- Battery Backup: Maintains timekeeping during power outages or system shutdown.
- Alarm Functions: Supports alarm settings for event scheduling.
- Periodic Interrupts: Useful for time-related system tasks and events.
- Wide Application: Suitable for a variety of computer, embedded, and industrial applications.
Cons:
- Obsolete: The MC146818AP is an older chip and may have limited availability in the market.
- Limited Features: Compared to modern RTC chips, the MC146818AP may lack advanced features and integration options.
Are There Any Equivalents/Alternatives to MC146818AP for Recommendation?
- The DS1387 from Maxim Integrated is an alternative real-time clock chip with similar functionality.
- Equivalent parts to the MC146818AP include the DS12885 from Maxim Integrated and the M48T86 from STMicroelectronics.
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