DS12885T

Overview

The DS12885T is a real-time clock and calendar IC manufactured by Analog Devices Inc./Maxim Integrated. It features a parallel interface and provides 114 bytes of non-volatile static RAM. The device supports HH:MM:SS time formats in both 12-hour and 24-hour modes, alongside YY-MM-DD-dd date formatting. It operates on a 4.5V to 5.5V supply with a maximum current consumption of 15mA at 4.5V. Designed for surface mount applications, it utilizes a 32-TQFP package measuring 7x7 mm and functions within a commercial temperature range of 0°C to 70°C.

Feature Summary

• Integrated 114-byte battery-backed NVSRAM
• Automatic leap year correction and daylight savings support
• Programmable square wave output and alarm functionality

Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing persistent calendar data
• Telecommunications infrastructure maintaining synchronized timestamps

Procurement Notes

Verify the specific suffix 'T' indicates tray packaging when sourcing. Confirm RoHS compliance status as historical records indicate some variants may not meet current environmental standards. Ensure the supplier provides valid datasheets matching the 32-TQFP form factor to avoid compatibility issues with existing PCB layouts.

Selection Notes

Select this component when a parallel interface is required for legacy system integration. The 114-byte memory capacity suits applications needing moderate non-volatile storage alongside timekeeping. Verify that the 4.5V to 5.5V operating voltage aligns with the target system's power rails before finalizing the design.

Part Context

This part belongs to the DS12885 family of real-time clocks designed as direct replacements for older DS1285 and DS1287 models. The 'T' suffix specifically denotes the 32-lead Thin Quad Flat Package (TQFP) variant, distinguishing it from PLCC or DIP packages offered in the same series.

Replacement Considerations

Direct substitutes include other parts within the DS12885 series such as the DS12885N+ or DS12885SN+, provided the package type matches the board design requirements.