DS12R885S-5+T&R

Overview

The DS12R885S-5+T&R is a real-time clock (RTC) and calendar integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides timekeeping for seconds, minutes, hours, day, date, month, and year with automatic leap-year compensation to the year 2100. The device includes 114 bytes of battery-backed static RAM and supports both Intel and Motorola multiplexed bus interfaces. It operates within a supply voltage range of 4.5V to 5.5V and features an integrated trickle charger for backup power sources. The component is housed in a 24-SOIC package and is rated for industrial operating temperatures from -40°C to +85°C.

Feature Summary

• Multiplexed byte-wide interface supporting Intel and Motorola bus timing modes
• 114 bytes of general-purpose nonvolatile RAM with clear input
• Integrated constant-voltage trickle charger for rechargeable batteries or super capacitors
• Automatic power-fail detection and switching circuitry

Applications

• Embedded systems requiring precise timekeeping
• Utility meters for data logging and billing cycles
• Security systems needing event timestamping
• Network hubs, bridges, and routers for synchronization

Procurement Notes

Verify that the specific ordering suffix T&R corresponds to the Tape & Reel packaging format as indicated in local product fields. Confirm that the -5+ suffix aligns with the required 4.5V to 5.5V VCC operating voltage range and lead-free/RoHS compliance status before finalizing procurement specifications.

Selection Notes

Select this model when a drop-in replacement for the DS12885 is required with multiplexed bus compatibility. Ensure the system design accommodates the 4.5V to 5.5V primary supply voltage. Consider the -33 variant if a 3.3V operation is necessary instead of the standard 5V logic levels provided by this specific part number.

Part Context

This component belongs to the DS12R885 series, which serves as a functional drop-in replacement for the legacy DS12885 RTC. The series integrates the RTC die with options for external crystals or encapsulated modules like the DS12CR887 and DS12R887. The SOIC package variant allows for surface-mount installation in standard PCB layouts.

Replacement Considerations

The DS12R885 is explicitly documented as a functional drop-in replacement for the DS12885. Designers migrating from older RTC designs should verify bus timing compatibility between Intel and Motorola modes.