DS12R887-33

Overview

The DS12R887-33 is a real-time clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides timekeeping and calendar functions with a parallel interface, supporting both 12-hour and 24-hour time formats alongside YY-MM-DD-dd date formatting. The device includes 114 bytes of non-volatile static RAM (NVSRAM). It operates within a supply voltage range of 2.97V to 3.63V and supports battery backup from 2V to 3.05V. Key features include an alarm function, leap year compensation, square wave output, and a trickle charger. The component is housed in a 48-PBGA package and is rated for industrial temperatures between -40°C and +85°C.

Feature Summary

• Integrated 114-byte NVSRAM for data retention
• Parallel bus interface with standard RTC control logic
• Trickle charger capability for battery maintenance
• Hardware alarm and square wave output generation

Applications

• Industrial systems requiring precise timekeeping in harsh environments
• Embedded controllers needing non-volatile data storage alongside RTC
• Battery-powered devices utilizing the trickle charger feature

Procurement Notes

Verify the specific suffix requirements for the DS12R887 series, as variations may exist regarding temperature grades or packaging options. Confirm that the 48-PBGA package aligns with the target PCB footprint and assembly capabilities. Ensure compatibility with the 2.97V–3.63V supply rail before integration into the system design.

Selection Notes

Select this component when a parallel interface is required instead of I2C or SPI. The 114-byte NVSRAM makes it suitable for applications storing configuration data or logs without external memory chips. Consider the 48-pin BGA package constraints for layout and reflow soldering profiles. Verify that the 2mA maximum current consumption fits the power budget during active timekeeping.

Part Context

This part belongs to the Maxim Integrated DS12R887 family of real-time clocks. These devices are designed to replace older discrete RTC solutions by integrating timekeeping, calendar, and SRAM functions into a single package. The parallel interface allows direct connection to microprocessors with address/data buses, simplifying system architecture compared to serial alternatives.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Users should consult official manufacturer documentation for cross-reference information or contact Analog Devices/Maxim Integrated directly for compatible replacements.