DS1747WP-120

Real Time Clock Overview

The DS1747WP-120+ is a Y2K-compliant, nonvolatile timekeeping RAM combining a real-time clock/calendar and 512k x 8 static RAM. Operating at 3.3V with a 0°C to +70°C temperature range, it features a 34-pin PowerCap module package. The device integrates a lithium energy source and crystal, providing over 10 years of data retention without power. RTC registers reside in the top eight RAM locations, supporting BCD-coded time/date with automatic leap year compensation up to 2100. It includes power-fail write protection and a battery voltage-level indicator flag.

Real Time Clock Feature Summary

• Integrated NV SRAM (512k x 8) and Real-Time Clock with Century Byte Register
• 34-pin PowerCap Module Board for surface-mount connection to external PowerCap
• Automatic Leap Year Compensation valid through the year 2100
• Power-Fail Write Protection and Battery Voltage-Level Indicator Flag

Real Time Clock Applications

• Systems requiring nonvolatile timekeeping and large data storage
• Industrial equipment needing Y2K compliance
• Applications utilizing separate PowerCap modules for battery and crystal integration

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 DS1747WP-120+. Confirm the specific suffix indicates lead-free/RoHS compliance. Ensure the system design accommodates the 34-pin PowerCap module board form factor and the separate mounting process for the PowerCap unit.

Real Time Clock Selection Notes

Select this model for 3.3V applications requiring a 34-pin surface-mountable RTC/SRAM combination. Choose the industrial variant (DS1747WP-120IND+) if operation below 0°C is required. Note that the DIP version (DS1747W-120+) integrates the battery internally, whereas the WP version requires an external PowerCap.

Real Time Clock Part Context

This part belongs to the DS174xP family of Y2K-compliant nonvolatile timekeeping RAMs. It is pin-for-pin compatible with other densities in the series, such as the DS1748 and DS1749, allowing for design flexibility across different memory requirements while maintaining identical interface protocols.

Real Time Clock Replacement Considerations

For direct replacements, consider the DS1747WP-120IND+ for extended temperature ranges. Other densities like the DS1748WP-120+ are pin-compatible but offer different RAM sizes. Verify that any substitute maintains the 3.3V supply requirement and 34-pin PowerCap module interface.