DS1501WS

Real Time Clock Overview

The DS1501WS is a Y2K-compliant real-time clock/calendar integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features a parallel interface, 256 bytes of battery-backed NV SRAM, and operates within a voltage range of 3V to 3.6V. The device provides century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format with automatic leap-year compensation valid up to the year 2100. Key specifications include a maximum active supply current of 10mA at 3.3V, an operating temperature range of 0°C to +70°C, and a 28-pin SOIC package.

Real Time Clock Feature Summary

• Y2K-Compliant RTC with Automatic Leap-Year Compensation
• 256 Bytes Battery-Backed NV SRAM
• Programmable Watchdog Timer and Day-of-Week/Date Alarm
• Precision Power-On Reset and Power-Control Circuitry

Real Time Clock Applications

• Remote Systems
• Battery-Backed Systems
• Telecom Switches
• Office Equipment
• Consumer Electronics

Real Time Clock Procurement Notes

Verify component authenticity through authorized distributors or official manufacturer channels. Confirm RoHS compliance status and check for specific manufacturing lot dates if required for legacy system maintenance. Ensure proper handling procedures are followed during installation to prevent electrostatic discharge damage.

Real Time Clock Selection Notes

Select this model for applications requiring a standalone RTC with integrated memory and power management features. Ensure the design supports a 3.3V logic level and utilizes a 28-pin SOIC footprint. Verify that the external crystal matches the specified load capacitance requirements for optimal timing accuracy.

Real Time Clock Part Context

This component belongs to the DS1501/DS1511 family of real-time clocks. The DS1501 variant functions as a chip requiring external components, whereas the DS1511 is a standalone module with embedded battery and crystal. Both share identical register maps and functional capabilities.

Real Time Clock Replacement Considerations

Direct replacements within the same series include the DS1501WE+ and DS1501WEN+. When substituting, verify that the pinout and electrical characteristics match the original design requirements to ensure compatibility.