DS1501WE+

Real Time Clock Overview

The DS1501WE+ is a Y2K-compliant real-time clock/calendar IC manufactured by Analog Devices Inc./Maxim Integrated. It operates at +3.3V with an operating temperature range of 0°C to +70°C and is housed in a 28-pin TSOP package. The device features a byte-wide parallel interface, 256 bytes of battery-backed NV SRAM, and a programmable watchdog timer. Key specifications include a maximum standby current of 4mA at 3V–3.6V, a battery voltage range of 2.5V to 3.7V, and automatic leap-year compensation valid up to the year 2100.

Real Time Clock Feature Summary

• Y2K-Compliant RTC with BCD-coded century, year, month, date, day, hours, minutes, and seconds
• 256 Bytes Battery-Backed NV SRAM with auxiliary battery input (VBAUX)
• Programmable Watchdog Timer and Day-of-Week/Date Alarm
• Precision Power-On Reset and Power-Control Circuitry for system wake-up

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 lead-free/RoHS compliance status via official documentation. Check for specific revision errata on the manufacturer website prior to integration. Ensure ordering suffixes match required temperature ranges and packaging formats.

Real Time Clock Selection Notes

Select the DS1501WE+ for applications requiring +3.3V operation within the commercial temperature range of 0°C to +70°C. Use the industrial variant (DS1501WEN+) if extended temperature coverage (-40°C to +85°C) is necessary. Ensure the design accommodates the 28-pin TSOP footprint and provides appropriate pull-up resistors for open-drain outputs like IRQ, PWR, and RST.

Real Time Clock Part Context

The DS1501WE+ belongs to the DS1501/DS1511 family of real-time clocks. While the DS1511 integrates an internal crystal and battery, the DS1501 requires external components. The 'W' suffix indicates +3.3V operation, distinguishing it from the '+5V' (Y) variants. The '+' denotes a lead-free and RoHS-compliant package configuration.

Real Time Clock Replacement Considerations

Direct substitutes within the same family include the DS1501WEN+ for industrial temperature ranges. For +5V applications, the DS1501YE+ or DS1501YN+ are functional equivalents with different voltage tolerances. Verify pin compatibility and register mapping when transitioning between these variants.