BQ4802YPWR

Overview

The BQ4802YPWR is a parallel real-time clock (RTC) integrated circuit manufactured by Texas Instruments, housed in a 28-pin TSSOP package. Designed for 5-V operation, it features a BCD-based calendar and clock counting through centuries. The device includes an on-chip battery-backup switchover circuit with nonvolatile control for external SRAM, consuming less than 500 nA in backup mode. It integrates a CPU supervisor with microprocessor reset, a programmable watchdog timer, and power-fail interrupt warnings. Key electrical parameters include a supply voltage range of 4.5 V to 5.5 V, a typical standby current of 1.5 mA, and a battery operation current of 0.3 µA to 0.5 µA at 3 V.

Feature Summary

• Parallel RTC interface with 16-byte register map supporting BCD time/date formats
• On-chip battery-backup switchover circuit for external SRAM nonvolatile memory control
• Microprocessor supervisor with push-button override reset and programmable watchdog timer
• Low-power consumption with less than 500 nA clock operation current in backup mode

Applications

• Telecommunications base stations
• Servers
• Handheld data collection equipment
• Medical equipment
• Test equipment

Procurement Notes

Verify the 'R' suffix indicates tape-and-reel packaging rather than tube packaging. Confirm the specific revision status as the component may be subject to discontinuation notices. Ensure compatibility with 5-V logic levels and verify that the 28-TSSOP footprint matches the design requirements before procurement.

Selection Notes

Select the BQ4802YPWR for systems requiring 5-V parallel interface RTCs with integrated SRAM backup management. Compare against the BQ4802YDW if tube packaging is preferred over reel packaging. Consider the BQ4802LY series for applications requiring 3.3-V operation instead of the standard 5-V variant.

Part Context

This part belongs to the BQ4802Y family of parallel real-time clocks from Texas Instruments. It shares functional similarities with the BQ4802YDW but differs in packaging format. The device is often paired with external CMOS SRAM and a 3-V lithium cell to provide comprehensive timekeeping and data retention solutions.

Replacement Considerations

Public confirmed substitute: DS12R885S-5+T&R (Analog Devices Inc./Maxim Integrated). Verify pinout and timing compatibility before substitution.