DS1554WP-120IND

Real Time Clock Overview

The DS1554WP-120IND+ is a nonvolatile, Y2K-compliant real-time clock/calendar integrated with 32k x 8 static RAM. It operates at 3.3V and supports an industrial temperature range of -40°C to +85°C. The device features a parallel interface with 15 address lines and 8 data lines. It includes an internal lithium battery source for over 10 years of data retention without power. Key functions include programmable alarms, watchdog timers, and power-fail write protection. The component is housed in a 34-pin PowerCap module package.

Real Time Clock Feature Summary

• Integrated RTC with BCD-coded registers and automatic leap-year compensation valid through 2100
• 32k x 8 Nonvolatile SRAM with identical access to clock registers
• Programmable watchdog timer and alarm with interrupt output (IRQ/FT)
• Power-fail write protection and precision power-on reset circuitry

Real Time Clock Applications

• Industrial systems requiring precise timekeeping during power outages
• Data logging equipment needing nonvolatile storage for timestamps
• Embedded controllers utilizing watchdog timer functionality for system stability

Real Time Clock Procurement Notes

Verify the specific ordering suffix IND+ confirms the industrial temperature grade (-40°C to +85°C) and lead-free/RoHS compliance. Confirm that the separate DS9034PCX+ or DS9034I-PCX+ PowerCap module containing the crystal and lithium battery is ordered separately, as it is not included with the base IC.

Real Time Clock Selection Notes

Select this model for applications requiring a 3.3V supply and surface-mount compatible PowerCap packaging. Ensure the design accommodates the separate mounting of the PowerCap module after SMT reflow to protect the internal battery and crystal from high soldering temperatures. Compare against the EDIP version if through-hole mounting is preferred.

Real Time Clock Part Context

This part belongs to the DS1554 family of timekeeping RAM devices. The 'W' indicates the 3.3V voltage variant, 'P' denotes the PowerCap package style, and 'IND' specifies the industrial temperature rating. It serves as a complete solution for maintaining system time and critical data in microcontroller-based designs.

Real Time Clock Replacement Considerations

Direct substitutes within the same family include the DS1554P-70IND+ for 5V operation or the DS1554W-120IND+ for through-hole EDIP packaging. Verify pin compatibility and voltage levels when cross-referencing.