DS1500W

Real Time Clock Overview

The DS1500W is a Y2K-compliant real-time clock/calendar IC featuring a parallel interface and 256 bytes of nonvolatile SRAM. It operates at +3.3V with a battery backup range of 2.5V to 3.7V. The device provides century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format with automatic leap-year compensation valid through 2100. Key features include a programmable watchdog timer, alarm, power-on reset, and auxiliary battery input for kickstart functionality. It supports industrial temperature ranges and includes precision power-fail detection.

Real Time Clock Feature Summary

• BCD-coded timekeeping with automatic leap-year compensation valid up to the year 2100
• Integrated 256-byte nonvolatile SRAM with NV control for external SRAM backup
• Programmable watchdog timer and time-of-day/date alarm with IRQ/PWR outputs
• +3.3V operation with auxiliary battery input (VBAUX) for kickstart and square-wave output

Real Time Clock Applications

• Remote systems requiring precise timekeeping
• Battery-backed embedded systems
• Telecom switches
• Office equipment
• Consumer electronics

Real Time Clock Procurement Notes

Verify component authenticity and check for revision-specific errata via manufacturer resources. Confirm package integrity and soldering compatibility prior to assembly. Ensure supply chain documentation matches the specific ordering suffix requirements for temperature and voltage ratings.

Real Time Clock Selection Notes

Select the DS1500WE+ variant for commercial temperature range (0°C to +70°C) or DS1500WEN+ for industrial range (-40°C to +85°C). Both variants support +3.3V logic. Ensure system design accommodates the 32-pin TSOP package dimensions and provides appropriate pull-up resistors for open-drain outputs like IRQ, PWR, and RST.

Real Time Clock Part Context

The DS1500 belongs to the Maxim Integrated/Analog Devices RTC family, designed as a comprehensive timing solution with integrated memory management. It serves as a standalone clock/calendar controller capable of managing system power states through its wake-up and reset capabilities, reducing external component count in complex embedded designs.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements within the same series include DS1500YE+ (5V, commercial) and DS1500YEN+ (5V, industrial). Verify voltage level compatibility when substituting 3.3V parts with 5V variants or vice versa.