DS1315EN-33/T&R

Real Time Clock Overview

The DS1315EN-33/T&R is a Phantom Time Chip combining a CMOS timekeeper and nonvolatile memory controller. It tracks hundredths of seconds, seconds, minutes, hours, day, date, month, and year with automatic leap year correction valid to 2100. Operating at +3.3V or +5V within an industrial temperature range (-40°C to +85°C), it interfaces via serial bit stream pattern recognition without requiring address space. The device supports redundant battery attachment for high reliability and provides power-fail detection and write protection for external SRAM.

Real Time Clock Feature Summary

• Real-time clock tracking hundredths of seconds through years with automatic leap year correction
• Nonvolatile controller functions for battery backup of external CMOS SRAM
• Supports redundant battery attachment for high-reliability applications
• Full ±10% VCC operating range with +3.3V or +5V operation

Real Time Clock Applications

• Systems requiring precise timekeeping with nonvolatile memory control
• High-reliability applications utilizing redundant battery configurations
• Industrial environments operating between -40°C and +85°C

Real Time Clock Procurement Notes

Verify the ordering suffix 'T&R' indicates tape and reel packaging. Confirm the 'N' designation in the part number corresponds to the industrial temperature range (-40°C to +85°C). Ensure the voltage rating matches the required system supply, as this specific variant is rated for 3.3V operation.

Real Time Clock Selection Notes

Select this component when both real-time clocking and nonvolatile RAM control are required in a single package. The serial interface eliminates address space usage for RTC communication. Verify compatibility with external CMOS SRAM and ensure the system design accommodates the 64-bit pattern recognition sequence for chip access.

Real Time Clock Part Context

This part belongs to the DS1315 Phantom Time Chip family manufactured by Analog Devices/Maxim Integrated. It is available in multiple packages including PDIP, SO, and TSSOP, with variants supporting commercial or industrial temperatures and 3.3V or 5V supplies. The EN-33 suffix specifically denotes the industrial temperature grade and 3.3V operation.

Real Time Clock Replacement Considerations

Direct replacements include other DS1315 variants such as DS1315EN-33+ or DS1315E-33+, depending on the required package type (TSSOP vs. PDIP/SO) and temperature range. Cross-model substitution with different RTC families requires verification of interface protocols and pinout compatibility.