DS1501YSN

Real Time Clock Overview

The DS1501YSN is a Y2K-compliant real-time clock/calendar integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features a parallel byte-wide interface, 256 bytes of battery-backed NV SRAM, and operates on a +5V supply (4.5V to 5.5V). The device provides timekeeping in 24-hour BCD format with automatic leap-year compensation up to the year 2100. Key functional blocks include a programmable watchdog timer, RTC alarm, precision power-on reset, and battery monitoring circuits. It utilizes a standard 32.768kHz quartz crystal for timing accuracy.

Real Time Clock Feature Summary

• Y2K-Compliant RTC with Automatic Leap-Year Compensation
• 256 Bytes Battery-Backed Non-Volatile SRAM
• Parallel Byte-Wide Interface with 70ns Access Time at 5V
• Programmable Watchdog Timer and Day-of-Week/Date Alarm

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 lead-free packaging specifications against current datasheet revisions. Check for specific ordering suffix requirements regarding temperature range and package type before procurement.

Real Time Clock Selection Notes

Select this model for applications requiring a dedicated +5V parallel interface RTC. Ensure system design accommodates the required 32.768kHz crystal load capacitance settings via the CS bit. Verify that the 28-pin SOIC package dimensions fit the PCB layout constraints and that the operating temperature range meets environmental requirements.

Real Time Clock Part Context

This part belongs to the DS1501/DS1511 family of real-time clocks. The 'Y' suffix indicates a +5V operation variant, while 'S' denotes the SOIC package. The 'N' typically signifies an industrial temperature grade or specific manufacturing lot designation within the Maxim Integrated product line.

Real Time Clock Replacement Considerations

Consult official cross-reference lists for verified substitutes. Ensure replacement parts maintain compatible voltage levels, pin configurations, and interface protocols if direct pin-to-pin substitution is required.