DS1511Y

Real Time Clock Overview

The DS1511Y is a Y2K-compliant real-time clock/calendar integrated circuit featuring an embedded 3V lithium battery and 32.768kHz crystal. It operates on a +5V supply (4.5V to 5.5V) within a commercial temperature range of 0°C to +70°C. The device provides timekeeping in 24-hour BCD format with automatic leap-year compensation valid through the year 2100. Key specifications include 256 bytes of battery-backed NV SRAM, a programmable watchdog timer, and an RTC alarm. It utilizes a byte-wide parallel interface for register access and includes precision power-on reset and battery voltage-level indicator flags.

Real Time Clock Feature Summary

• Integrated Stand-Alone Module: Contains embedded 3V lithium battery and 32.768kHz crystal, eliminating external component requirements.
• Parallel Interface: Byte-wide access via A0-A4 address lines and DQ0-DQ7 data I/O pins.
• Timekeeping Accuracy: Factory trimmed accuracy better than ±1 minute/month at +25°C.
• Power Management: Precision power-on reset, battery switchover circuitry, and auxiliary battery input support.

Real Time Clock Applications

• Remote Systems
• Battery-Backed Systems
• Telecom Switches
• Office Equipment
• Consumer Electronics

Real Time Clock Procurement Notes

Verify the specific suffix 'Y' confirms the +5V operating voltage and EDIP-28 package configuration. Confirm RoHS compliance status as indicated by the '+' designation in ordering information. Ensure the application design accounts for the commercial temperature range limits specified for this variant.

Real Time Clock Selection Notes

Select the DS1511Y when a self-contained RTC solution with +5V logic levels is required. This model is distinct from the DS1501 series, which offers industrial temperature ranges and lower voltage options. Verify that the system architecture supports parallel bus interfacing and accommodates the 28-pin EDIP footprint constraints.

Real Time Clock Part Context

The DS1511 belongs to the DS1501/DS1511 family of Y2K-compliant watchdog real-time clocks. Unlike the DS1501, which requires external crystals and batteries, the DS1511 integrates these components into a single encapsulated module. This differentiation simplifies PCB layout and reduces bill-of-materials complexity for standard commercial applications.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility if considering alternative RTC modules, noting differences in voltage tolerances and package types between the DS1511 and other family members like the DS1501.