DS1747P-70+

Real Time Clock Overview

The DS1747P-70+ is a Y2K-compliant, nonvolatile timekeeping RAM featuring an integrated real-time clock/calendar and 512k x 8 static RAM. It utilizes a 34-pin PowerCap module package designed for surface-mount assembly, requiring a separate DS9034PCX+ or DS9034I-PCX+ PowerCap containing the lithium energy source and crystal. Operating at 5.0V with a commercial temperature range of 0°C to +70°C, it provides automatic leap year compensation up to 2100. The device includes power-fail write protection and a battery voltage-level indicator flag.

Real Time Clock Feature Summary

• Integrated RTC, 512k NV SRAM, crystal interface, and power-fail control circuit in a 34-pin PowerCap Module Board
• Y2K-compliant BCD-coded registers with automatic leap year compensation valid through 2100
• Power-fail write protection ensures data integrity during supply voltage outages
• Lithium energy source electrically disconnected until first power application to preserve freshness

Real Time Clock Applications

• Industrial systems requiring robust nonvolatile timekeeping
• Embedded controllers needing combined memory and calendar functions
• Equipment requiring high data retention reliability without external battery soldering

Real Time Clock Procurement Notes

Verify that the required PowerCap component (DS9034PCX+ or DS9034I-PCX+) is ordered separately, as it is not included with the DS1747P-70+. Confirm the specific package type matches the design requirements, as the DS1747P variant requires surface-mount assembly distinct from the standard DIP modules.

Real Time Clock Selection Notes

Select the DS1747P-70+ when surface-mount technology is preferred over through-hole DIP packaging. Ensure the system design accommodates the separate mounting of the PowerCap after the reflow process to protect the internal components from high temperatures. Verify compatibility with the 5.0V supply voltage and commercial temperature range specifications.

Real Time Clock Part Context

The DS1747P-70+ belongs to the DS174x family of nonvolatile timekeeping RAMs. It shares functional pinouts with other densities in the series, allowing for density upgrades within the same package footprint. The 'P' suffix specifically denotes the PowerCap module board configuration, distinguishing it from the encapsulated EDIP DIP modules.

Real Time Clock Replacement Considerations

Pin-for-pin compatible with other densities of the DS174xP timekeeping RAM series.