Texas Instruments

BQ4822YMA-70

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.