DS1743P-100+

Real Time Clock Overview

The DS1743P-100+ is a Y2K-compliant, nonvolatile timekeeping RAM featuring an integrated real-time clock/calendar and 8k x 8 static RAM. It utilizes a 34-pin PowerCap module board package designed for surface-mount assembly. The device operates on a single 5V supply within a commercial temperature range of 0°C to +70°C. Time and date information is stored in binary-coded decimal format with automatic leap year compensation valid through 2099. The architecture includes double-buffered clock registers and power-fail write protection to ensure data integrity during voltage fluctuations.

Real Time Clock Feature Summary

• Integrates RTC, 8KB NV SRAM, crystal, and lithium battery source into a single system solution
• BCD-coded timekeeping with automatic leap year correction valid through 2099
• Power-fail write protection circuitry prevents data corruption during supply voltage anomalies
• Lithium energy source remains electrically disconnected until initial VCC application

Real Time Clock Applications

• Industrial control systems requiring precise time stamping
• Data logging equipment needing nonvolatile storage with calendar functions
• Embedded controllers utilizing standard JEDEC bytewide RAM pinouts

Real Time Clock Procurement Notes

Verify the specific suffix 'IND' if industrial temperature ratings (-40°C to +85°C) are required, as the -100+ variant is rated for commercial temperatures (0°C to +70°C). Confirm that the separate DS9034PCX+ or DS9034I-PCX+ PowerCap modules are ordered independently, as they are not included with the base component. Ensure the design accommodates the 34-pin PowerCap Module Board footprint.

Real Time Clock Selection Notes

Select this model when a surface-mountable RTC with integrated battery support is necessary. The PowerCap design allows the battery and crystal assembly to be mounted after reflow soldering, protecting sensitive components from high heat. Compare against the 28-pin EDIP module version if through-hole mounting is preferred instead of surface mount.

Real Time Clock Part Context

This component belongs to the DS174x family of Y2K-compliant timekeeping RAMs. It offers pin-for-pin compatibility with other densities in the series, facilitating density upgrades without redesigning the PCB layout. The PowerCap packaging distinguishes it from standard DIP modules by separating the battery/crystal assembly from the silicon die.

Real Time Clock Replacement Considerations

The DS1743P-100IND+ serves as the industrial temperature grade replacement for the same package type. For through-hole applications, the DS1743-100+ provides equivalent functionality in a 28-pin EDIP module.