DS1315S-33+T&R

Overview

The DS1315S-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. The device operates at +3.3V or +5V with an industrial temperature range of -40°C to +85°C. It interfaces via a serial bit stream requiring 64 consecutive write cycles for pattern recognition. In battery backup mode, it supplies power to external CMOS SRAM through the VCCO pin, maintaining data integrity during power failures.

Feature Summary

• Combines real-time clock/calendar with nonvolatile SRAM controller
• Serial interface using 64-bit pattern recognition (Hex: C5, 3A, A3, 5C...)
• Automatic leap year correction valid up to the year 2100
• Supports redundant battery attachment for high-reliability applications

Applications

• Systems requiring precise timekeeping without dedicated RTC address space
• Battery-backed memory systems converting CMOS SRAM to nonvolatile storage
• High-reliability industrial equipment with redundant power sources

Procurement Notes

Verify the package type matches the 'S' suffix (SOIC-16) and the voltage rating corresponds to the '-33' designation (+3.3V). Confirm the '+T&R' suffix indicates tape and reel packaging. Ensure the component meets RoHS compliance standards as indicated by the '+' symbol in the part number.

Selection Notes

Select this component when a combined timekeeping and memory control function is required in a single IC. The DS1315 eliminates the need for separate RTC and NVSRAM controllers. Consider the 64-bit serial access method for system integration, which avoids occupying standard memory address space. Verify compatibility with external 32.768kHz crystals having a 6pF load capacitance.

Part Context

The DS1315 series includes variants with different operating temperatures and voltages. The 'N' suffix denotes industrial temperature range (-40°C to +85°C), while the base model covers commercial range (0°C to +70°C). The 'S' indicates SOIC packaging, and 'E' indicates TSSOP. The specific model DS1315S-33+T&R combines the industrial temperature range, SOIC package, 3.3V operation, and tape-and-reel delivery.

Replacement Considerations

Direct replacements within the same family include DS1315SN-33+T&R (same specs, different manufacturer branding history) or other Maxim Integrated/Analog Devices RTC/NVSRAM combos. Cross-model substitution requires verifying pin compatibility and serial protocol adherence.