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BQ4822YMA-70
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BQ4822YMA-70 Description
BQ4822YMA-70 Description
The BQ4822YMA-70 from Texas Instruments is a parallel-interface real-time clock (RTC) and calendar IC designed for precision timekeeping in embedded systems. Operating within a 4.5V to 5.5V supply range, this obsolete but robust component ensures accurate time/date tracking with a 24-hour format (HH:MM:SS:hh). It features a through-hole 28-DIP package, making it suitable for legacy or industrial applications requiring durable mounting. With a 6mA max timekeeping current, it balances power efficiency and reliability, even in environments with 0°C to 70°C operating temperatures.
BQ4822YMA-70 Features
- Integrated Clock/Calendar: Tracks time, date, and leap years with high accuracy.
- Advanced Functions: Includes alarm, watchdog timer, and supervisor capabilities for system monitoring and fault recovery.
- Parallel Interface: Simplifies integration with older microcontrollers or systems lacking serial interfaces.
- Wide Voltage Range: Operates reliably from 2.2V to 5.8V for timekeeping, ensuring stability during power fluctuations.
- Industrial Durability: ROHS3 compliant and REACH unaffected, suitable for harsh environments.
- Legacy Support: Ideal for maintaining or upgrading systems where modern RTCs may not be pin-compatible.
BQ4822YMA-70 Applications
- Industrial Automation: Time-stamping logs, scheduling tasks, or synchronizing processes in PLCs.
- Legacy Equipment: Upgrading or repairing older systems requiring parallel-interface RTCs.
- Embedded Systems: Critical for applications needing battery-backed timekeeping, such as medical devices or instrumentation.
- Supervisory Systems: Leveraging its watchdog timer and voltage supervisor to enhance fault tolerance.
Conclusion of BQ4822YMA-70
While marked obsolete, the BQ4822YMA-70 remains a viable choice for rugged, parallel-interface timekeeping in legacy or industrial designs. Its alarm, leap-year correction, and supervisory features provide added value over basic RTCs, making it ideal for systems demanding reliability without modern serial interfaces. Engineers maintaining older hardware or requiring specific through-hole mounting will find this IC a dependable solution.



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