DS1501W+

Real Time Clock Overview

The DS1501W+ 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 3.0V to 3.6V at temperatures from 0°C to +70°C. The device provides timekeeping in 24-hour BCD format with automatic leap-year compensation valid up to the year 2100. Key electrical parameters include an active supply current of 10mA (max) and a standby current of 4mA (max). It includes a programmable watchdog timer, RTC alarm, power-on reset, and battery monitors.

Real Time Clock Feature Summary

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

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 direct manufacturer channels. Confirm RoHS compliance status and check for specific manufacturing revisions or errata documentation relevant to the production batch before integration into final designs.

Real Time Clock Selection Notes

Select the DS1501W+ for applications requiring a standalone encapsulated DIP module with embedded battery and crystal. Ensure the design supports the required 3.3V logic levels and parallel bus interface. Verify that the system can accommodate the specified operating temperature range of 0°C to +70°C.

Real Time Clock Part Context

The DS1501W+ belongs to the DS1501/DS1511 family of Y2K-compliant watchdog real-time clocks. While the DS1501 series offers various packages including TSOP and SOIC, the 'W' suffix specifically denotes the EDIP-28 encapsulated DIP module form factor which integrates the necessary energy source and oscillator components internally.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.