DS1315-5+

Real Time Clock Overview

The DS1315-5+ is a Phantom Time Chip combining a CMOS real-time clock and nonvolatile memory controller. It tracks hundredths of seconds, time, date, and year with automatic leap year correction up to 2100. Operating at +5V (4.5V–5.5V), it uses serial pattern recognition for communication without address space allocation. The device supports battery backup for external SRAM via redundant BAT1/BAT2 inputs and includes power-fail detection. It operates in commercial temperature ranges (0°C to +70°C) and interfaces directly with standard 32.768kHz crystals.

Real Time Clock Feature Summary

• Integrated Real-Time Clock tracking hundredths of seconds through years with automatic leap year correction valid until 2100
• Nonvolatile Memory Controller providing battery backup switching for external CMOS SRAM or ROM support
• Serial Pattern Recognition Interface requiring no dedicated address space for RTC communication
• Redundant Battery Inputs (BAT1, BAT2) with automatic high-voltage selection for high-reliability applications

Real Time Clock Applications

• Systems requiring precise timekeeping with nonvolatile memory backup capabilities
• Industrial equipment needing redundant battery power management for data retention
• Embedded controllers interfacing with external RAM/ROM where address space conservation is critical

Real Time Clock Procurement Notes

Verify the specific package variant required, as the DS1315 family includes PDIP, SO, and TSSOP options. Confirm that the +5V voltage rating aligns with system supply rails. Check for lead-free/RoHS compliance status indicated by the '+' suffix. Ensure the commercial temperature range (0°C to +70°C) meets environmental requirements; use the 'N' suffix variant for industrial temperatures (-40°C to +85°C).

Real Time Clock Selection Notes

Select this component when a combined RTC and nonvolatile memory controller is needed to simplify board design. Choose the -5+ suffix for +5V logic systems. Consider the PDIP-16 package for through-hole mounting or SO-16 for surface mount. Verify crystal load capacitance requirements (typically 6pF) for the X1/X2 pins. Ensure the system can accommodate the 64-bit serial pattern recognition sequence for RTC access.

Real Time Clock Part Context

The DS1315 is part of the Maxim Integrated (now Analog Devices) Phantom Time Chip family. It serves as a drop-in replacement for legacy devices like the DS1215. The '-5+' designation specifically indicates the +5V operating voltage version with lead-free/RoHS-compliant packaging. Other variants include -33+ for 3.3V operation and 'N' suffixes for extended industrial temperature ranges.

Real Time Clock Replacement Considerations

The datasheet identifies the DS1315 as a direct drop-in replacement for the Dallas Semiconductor DS1215. When substituting, verify pin compatibility and ensure the new device supports the same 64-bit serial pattern recognition protocol. Confirm that the voltage levels and battery backup switching characteristics match the original design requirements.