DS1500YEN

Real Time Clock Overview

The DS1500YEN is a Y2K-compliant real-time clock (RTC) and calendar integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features 256 bytes of nonvolatile SRAM, a watchdog timer, power-on reset, and battery monitors. The device utilizes an 8-bit parallel interface for register access and supports automatic leap-year compensation valid through the year 2100. It operates on a +5V supply with a range of 4.5V to 5.5V, while battery backup voltage ranges from 2.5V to 3.7V. The maximum standby current is 5mA at the specified supply voltage. This industrial-grade component functions within a temperature range of -40°C to +85°C and is housed in a 32-pin TSOP package.

Real Time Clock Feature Summary

• Year 2000 compliant RTC with BCD-coded century, year, month, date, day, hours, minutes, and seconds registers.
• Integrated 256-byte nonvolatile SRAM with automatic write protection and external SRAM backup control.
• Programmable watchdog timer and time-of-day alarm with interrupt output capabilities.
• Precise power-on reset circuitry and battery voltage-level indicator flags.

Real Time Clock Applications

• Remote systems requiring reliable timekeeping
• Battery-backed data storage systems
• Telecom switches
• Office equipment
• Consumer electronics

Real Time Clock Procurement Notes

Verify that the ordering suffix 'N' corresponds to the industrial temperature range (-40°C to +85°C) as indicated in the manufacturer's documentation. Confirm the specific voltage variant matches system requirements; the 'Y' prefix denotes +5V operation. Ensure compatibility with the 32-pin TSOP surface-mount package dimensions during PCB layout.

Real Time Clock Selection Notes

Select this component when a parallel interface is required for high-speed register access compared to serial alternatives. The industrial temperature rating makes it suitable for harsh environments. Consider the auxiliary battery input (VBAUX) if kickstart or square-wave functionality is needed during power loss. Verify crystal load capacitance requirements (6pF or 12.5pF) for optimal accuracy.

Real Time Clock Part Context

The DS1500YEN belongs to the DS1500 family of Y2K Watchdog RTCs with Nonvolatile Control. It is functionally similar to the DS1500YE but differs in operating temperature range and compliance markings. The 'N' suffix specifically identifies the industrial grade version, while the '+' indicates lead-free/RoHS compliance. Other variants include the DS1500WE+ for 3.3V commercial applications.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Designers should consult official cross-reference lists or application notes for compatible devices from Analog Devices/Maxim Integrated.