DS12885N

Overview

The DS12885N is a real-time clock and calendar integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides timekeeping functions with a parallel interface, supporting both 12-hour and 24-hour time formats alongside a YY-MM-DD-dd date format. The device includes 114 bytes of battery-backed static RAM (NVSRAM) for data retention. It operates within a supply voltage range of 4.5V to 5.5V, drawing a maximum current of 15mA during timekeeping. The component is housed in a 24-pin DIP package and is rated for an extended operating temperature range from -40°C to +85°C.

Feature Summary

• Integrated real-time clock/calendar with automatic leap year correction
• 114 bytes of battery-backed NVSRAM for non-volatile data storage
• Supports alarm, daylight savings time, and programmable square wave output
• Automatic power-fail detection and switching to backup supply

Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing non-volatile memory retention
• Telecommunications infrastructure monitoring
• Embedded systems with extended temperature requirements

Procurement Notes

Verify the specific package variant, as the DS12885 family includes multiple form factors such as SO-24, PLCC, and TQFP. Confirm that the parallel interface compatibility matches the host system's bus architecture. Ensure the 4.5V to 5.5V supply voltage aligns with the target application's power rails before procurement.

Selection Notes

Select the DS12885N when a through-hole 24-DIP package is required for prototyping or legacy board designs. Consider alternative packages like the DS12885SN+ for surface-mount applications. Verify that the 114-byte RAM capacity meets the data storage needs, as other variants may offer different memory sizes or integrated crystal options.

Part Context

The DS12885 series serves as a direct replacement for older industry-standard RTCs like the DS1285 and DS1287. It is part of a broader family that includes variants with integrated crystals (DS12887) and different packaging options. The N suffix specifically denotes the standard 24-pin DIP configuration suitable for breadboard or through-hole PCB mounting.

Replacement Considerations

The DS12885T is listed as a discontinued direct substitute option within the same manufacturer portfolio.