DS1554P-70

Real Time Clock Overview

The DS1554P-70 is a nonvolatile, Y2K-compliant timekeeping RAM device integrating a real-time clock (RTC), 32k x 8 static RAM, crystal, and lithium energy source. It utilizes a parallel interface with 15 address lines (A0–A14) and 8 data lines (DQ0–DQ7). The RTC maintains century, year, month, date, day, hours, minutes, and seconds in BCD format with automatic leap-year compensation valid through 2100. Operating at 5V, it features programmable watchdog timer and alarm functions, power-fail write protection, and battery voltage-level indication. The component is housed in a 34-pin PowerCap module package.

Real Time Clock Feature Summary

• Integrated 32k x 8 NV SRAM with RTC registers mapped to the top 16 RAM locations
• Y2K-compliant clock/calendar with automatic leap-year correction valid to 2100
• Programmable watchdog timer and RTC alarm with interrupt output
• Power-fail write protection and precision power-on reset circuitry

Real Time Clock Applications

• Systems requiring precise timekeeping with nonvolatile data storage
• Industrial equipment needing Y2K compliance and battery-backed memory
• Embedded controllers utilizing watchdog timer for system stability

Real Time Clock Procurement Notes

Verify the specific ordering suffix against the manufacturer's current catalog, as the DS1554P-70+ denotes the commercial temperature range variant. Confirm compatibility with the separate DS9034PCX PowerCap module, which contains the required crystal and lithium battery and must be ordered independently. Check for availability of industrial grade (-40°C to +85°C) variants if environmental conditions require extended temperature operation.

Real Time Clock Selection Notes

Select the DS1554P-70 for applications requiring a parallel interface and integrated timekeeping with significant nonvolatile storage capacity. Ensure the design accommodates the 34-pin PowerCap module form factor and the separate mounting of the DS9034PCX battery/crystal unit post-reflow. Verify that the 5V supply voltage aligns with system requirements, as 3.3V variants exist under different part numbers.

Real Time Clock Part Context

The DS1554 series belongs to Maxim Integrated's family of nonvolatile timekeeping RAM devices. The 'P' suffix indicates the 34-pin PowerCap module package, distinct from the 32-pin EDIP DIP modules. This packaging strategy allows the sensitive crystal and battery components to be mounted after surface mount processing to prevent thermal damage.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consider evaluating other DS1554 variants or newer Analog Devices RTC solutions for updated supply chain availability.