Texas Instruments BQ4802LY Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V Vcc BQ4802LYDWG4

The BQ4802LY is a Y2K-compliant parallel real-time clock (RTC) designed for 3.3V operation, integrating a CPU supervisor and external non-volatile SRAM control. It features a time-of-day clock that counts seconds through centuries in BCD format, making it suitable for applications requiring accurate timekeeping. The device includes an on-chip battery-backup switchover circuit, ensuring operation with less than 500 nA of current in backup mode. This RTC supports a variety of functionalities, including a microprocessor reset with a push-button override, an independent watchdog timer with a programmable time-out period, and power-fail interrupt warnings. It also provides programmable clock alarm interrupts and periodic interrupts, along with a battery-low warning feature. The BQ4802LY is available in multiple package options, including 28-pin SOIC, TSSOP, and SNAPHAT, making it versatile for different design requirements. Typical applications for the BQ4802LY include telecommunications base stations, servers, handheld data collection equipment, medical devices, and industrial control systems. The device is designed to maintain SRAM information during power outages, making it a reliable choice for projects that require persistent data storage and accurate timekeeping.