DS1501YE

Real Time Clock Overview

The DS1501YE is a Y2K-compliant real-time clock/calendar featuring a byte-wide parallel interface. It provides century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format with automatic leap-year compensation valid through 2100. The device includes a programmable watchdog timer, RTC alarm, power-on reset, battery monitors, and 256 bytes of NV SRAM. Operating at +5V (Y suffix), it supports a 32.768kHz output and utilizes an external crystal connected to X1/X2 pins for timekeeping accuracy.

Real Time Clock Feature Summary

• Year 2000 compliant with automatic leap-year correction valid up to 2100
• Integrated 256-byte non-volatile SRAM and programmable watchdog timer
• +5V operation with precision power-on reset and battery voltage-level indicators
• Supports system wakeup via date/day/time alarm or kickstart signal

Real Time Clock Applications

• Remote systems requiring low-power timekeeping
• Battery-backed embedded systems
• Telecom switches
• Office equipment
• Consumer electronics

Real Time Clock Procurement Notes

Verify the specific ordering suffix against the datasheet table. The 'Y' indicates +5V operation, while 'W' denotes +3.3V. Confirm temperature range requirements: standard industrial (-40°C to +85°C) uses the 'N' suffix (e.g., DS1501WEN+). Ensure lead-free/RoHS compliance if required by checking for the '+' designation in the part number.

Real Time Clock Selection Notes

Select the DS1501YE for +5V logic applications. For +3.3V systems, use the DS1501WE variant. If an integrated module with embedded battery and crystal is preferred over the discrete chip, consider the DS1511 series. Ensure the external crystal load capacitance matches the CS bit setting in Control Register B (6pF or 12.5pF) for optimal accuracy.

Real Time Clock Part Context

The DS1501/DS1511 family consists of full-function RTCs from Analog Devices Inc./Maxim Integrated. The DS1501 is available as a standalone chip in TSOP packages, while the DS1511 is offered as an encapsulated DIP module with an embedded battery and crystal. Both share identical register maps and functional capabilities, differing primarily in packaging and power supply options.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Verify compatibility with existing circuit designs when substituting, particularly regarding voltage levels (+5V vs +3.3V) and package pinouts.