DS17885S-5/T&R+

Real Time Clock Overview

The DS17885S-5/T&R+ is a real-time clock (RTC) IC from the DS17x85 family, designed as a successor to the DS12885. It features a multiplexed byte-wide interface and provides 8192 bytes of battery-backed NV SRAM in addition to 114 bytes of general-purpose RAM. The device includes a silicon serial number, power-on/off control circuitry, and automatic power-fail detection. It supports +3.0V or +5.0V operation with a 24-pin SO package.

Real Time Clock Feature Summary

• 8192 Bytes Extended Battery-Backed NV SRAM
• Multiplexed Byte-Wide Interface
• Automatic Power-Fail Detect and Switch Circuitry
• 64-Bit Silicon Serial Number

Real Time Clock Applications

• Embedded Systems
• Utility Meters
• Security Systems
• Network Hubs, Bridges, and Routers

Real Time Clock Procurement Notes

Verify the specific suffix 'T&R+' indicates tape-and-reel packaging when sourcing. Confirm the '-5' designation corresponds to the +5.0V supply voltage variant. Ensure the manufacturer is identified as Analog Devices Inc./Maxim Integrated for compatibility with official documentation.

Real Time Clock Selection Notes

Select this component for systems requiring extended nonvolatile memory storage alongside timekeeping. The multiplexed interface requires appropriate address/data bus handling. Verify that the system can support the required VCC and VBAT/VBAUX voltage levels for proper backup switching.

Real Time Clock Part Context

This part belongs to the DS17285/DS17485/DS17885 series, which are successors to the industry-standard DS12885. The DS17885 variant specifically distinguishes itself by providing 8KB of extended battery-backed NV SRAM compared to the 2KB or 4KB options in other family members.

Real Time Clock Replacement Considerations

The DS12885 is listed as an industry-standard predecessor. However, the DS17885 offers enhanced functions like extended RAM and silicon serial numbers. Direct pin-for-pin replacement may require software adjustments due to register differences.