DS1501WS+T&R

Real Time Clock Overview

The DS1501WS+T&R is a Y2K-compliant real-time clock/calendar integrated circuit manufactured by Analog Devices/Maxim Integrated. It features a parallel interface, 256 bytes of battery-backed NV SRAM, and operates at +3.3V with an industrial temperature range of -40°C to +85°C. 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 electrical parameters include a typical active supply current of 10mA at 3.3V and standby currents of 4mA (TTL) or 4mA (CMOS). It includes programmable watchdog timers, alarms, power-on reset, and battery monitors.

Real Time Clock Feature Summary

• Y2K-Compliant RTC with Automatic Leap-Year Compensation Valid Up to Year 2100
• 256 Bytes Battery-Backed NV SRAM with Auxiliary Battery Input
• Programmable Watchdog Timer and RTC Alarm with Day-of-Week/Date Support
• +3.3V Operation with Industrial Temperature Range (-40°C to +85°C)

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify the specific suffix 'T&R' indicates tape and reel packaging as defined in the ordering information. Confirm the 'W' designation corresponds to the 3.3V voltage variant and industrial temperature grade. Check for lead-free/RoHS compliance status indicated by the '+' symbol. Ensure availability aligns with restricted supply conditions noted in distributor records.

Real Time Clock Selection Notes

Select this component when a 3.3V parallel interface RTC is required for industrial environments. The DS1501WE+ is the standard commercial version; the DS1501WEN+ covers the extended temperature range. Verify crystal load capacitance requirements (6pF or 12.5pF) match the system design. Ensure VBAUX is utilized if kickstart or square-wave functions are needed during battery backup.

Real Time Clock Part Context

The DS1501 series belongs to Maxim Integrated's family of Y2K-compliant watchdog real-time clocks. The DS1501WS+T&R specifically denotes the 3.3V, TSOP-28 package variant in tape and reel format. It shares functional similarities with the DS1511 module but requires external crystal and battery components. The device integrates power-control circuitry for system wake-up capabilities.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers: DS1501WE+, DS1501WEN+, DS1501WEN+T&R.