DS1501WZN+T&R

Real Time Clock Overview

The DS1501WZN+T&R is a Y2K-compliant real-time clock/calendar with a parallel interface, housed in a 28-pin TSOP package. It operates on a +3.3V supply (3.0V to 3.6V) and supports an industrial temperature range of -40°C to +85°C. The device integrates 256 bytes of battery-backed NVSRAM, a programmable watchdog timer, and an RTC alarm. It features automatic leap-year compensation valid through the year 2100 and includes power-fail detection with data retention capabilities.

Real Time Clock Feature Summary

• Y2K-compliant RTC with BCD-coded century, year, month, date, day, hours, minutes, and seconds
• 256-byte battery-backed NVSRAM with automatic power switchover
• Programmable watchdog timer and time-of-day/date alarm
• +3.3V operation with precision power-on reset and battery voltage-level indicators

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 the specific suffix 'T&R' indicates tape-and-reel packaging for automated assembly. Confirm the 'W' designation corresponds to the 3.3V operating voltage variant. Ensure the component meets RoHS compliance standards as indicated by the '+' suffix. Check for any manufacturer-specified errata relevant to this revision before finalizing procurement specifications.

Real Time Clock Selection Notes

Select this part for applications requiring a standalone RTC with integrated memory and watchdog functionality. Ensure the system design accommodates a 28-pin TSOP footprint. Verify that the external crystal matches the specified load capacitance (6pF or 12.5pF) for optimal accuracy. Confirm that the parallel interface timing requirements align with the host microcontroller's capabilities.

Real Time Clock Part Context

This component belongs to the DS1501/DS1511 family of Y2K-compliant watchdog real-time clocks. The DS1501 variant is a chip-only solution, whereas the DS1511 includes an embedded battery and crystal. The DS1501WZN+T&R specifically denotes the 3.3V industrial grade version in a tape-and-reel TSOP-28 package manufactured by Analog Devices/Maxim Integrated.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements within the same family include the DS1501WE+ and DS1501WEN+. Note that the DS1501WE+ operates in the commercial temperature range (0°C to +70°C), while the DS1501WEN+ covers the industrial range (-40°C to +85°C). Verify voltage and temperature specifications match the original design requirements.