DS1501WE

Real Time Clock Overview

The DS1501WE is a Y2K-compliant real-time clock/calendar integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It operates on a +3.3V supply within a 0°C to +70°C temperature range and is housed in a 28-pin TSOP package. The device features a byte-wide parallel interface, 256 bytes of NVSRAM, and an RTC alarm with watchdog timer capabilities. Key electrical parameters include a 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 NVSRAM with auxiliary battery input support
• Programmable Watchdog Timer and RTC Alarm with Day-of-Week/Date options
• Precise Power-On Reset and Power-Control Circuitry for system power management

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 lead-free/RoHS compliance status as indicated by the '+' suffix. Check for specific revision errata via the manufacturer's technical support resources before integration into final designs.

Real Time Clock Selection Notes

Select the DS1501WE for applications requiring a 3.3V parallel interface RTC with integrated memory. Ensure crystal selection matches the specified load capacitance (6pF or 12.5pF) using the CS bit. Verify that the operating temperature range of 0°C to +70°C meets system requirements.

Real Time Clock Part Context

The DS1501WE belongs to the DS1501/DS1511 family of Y2K-compliant watchdog real-time clocks. While the DS1511 is a standalone encapsulated module with an embedded battery and crystal, the DS1501 is a chip-only variant requiring external components. The 'W' suffix denotes the 3.3V operation variant.

Real Time Clock Replacement Considerations

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