DS17485S-5/T&R/C01

Real Time Clock Overview

The DS17485S-5/T&R/C01 is a Real-Time Clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features a parallel interface and includes an on-chip 4KB Non-Volatile Static RAM (NVSRAM). The device operates with a main supply voltage of 4.5V to 5.5V and supports a backup battery input ranging from 2.5V to 3.7V. It provides clock/calendar functionality with alarm, daylight savings, leap year, and square wave output capabilities. The component is housed in a 24-SOIC package and is currently classified as obsolete.

Real Time Clock Feature Summary

• Integrated 4KB NVSRAM for data retention
• Parallel bus interface for microcontroller connection
• Hardware support for alarms, daylight savings time, and leap years
• Dual power supply: VCC (4.5V–5.5V) and VBAT (2.5V–3.7V)

Real Time Clock Applications

• Industrial control systems requiring persistent timekeeping
• Data logging equipment needing non-volatile storage
• Embedded systems utilizing parallel bus architectures

Real Time Clock Procurement Notes

This part number is officially listed as obsolete and no longer manufactured by the producer. Availability is restricted to existing stock or secondary market sources. Verification of authenticity and lot traceability is critical when sourcing from distributors. Buyers should confirm the specific suffix details against official documentation to ensure compatibility with legacy designs.

Real Time Clock Selection Notes

Select this component only for legacy designs already utilizing the DS17485 series parallel interface. The 4KB NVSRAM capacity distinguishes it from smaller variants like the DS17285. Designers must account for the 24-SOIC surface-mount package dimensions and the requirement for both main and backup power rails during system architecture planning.

Real Time Clock Part Context

The DS17485 belongs to the DS17x85 family of RTCs, which are characterized by their parallel interfaces and substantial onboard memory. This specific variant differs from the DS17285 primarily through its increased 4KB NVSRAM storage capacity compared to the 2KB found in other models within the same series.

Real Time Clock Replacement Considerations

Direct substitutes include the lead-free versions DS17485S-5+ and DS17485S-5+T&R. These equivalents maintain identical electrical and functional specifications while complying with RoHS standards.