DS1743WP-120+

Real Time Clock Overview

The DS1743WP-120+ is a Y2K-compliant, nonvolatile timekeeping RAM integrating an 8k x 8 SRAM and a real-time clock/calendar. Operating at 3.3V with a 120ns access time, it features BCD-coded time registers in the top eight memory locations. The device includes a lithium energy source for over 10 years of data retention without power. It utilizes a 34-pin PowerCap module board package, requiring a separate DS9034PCX+ or DS9034I-PCX+ PowerCap containing the crystal and battery.

Real Time Clock Feature Summary

• Integrates 8k x 8 NV SRAM and RTC with automatic leap year compensation valid through 2099
• Features power-fail write protection and low-battery-voltage indicator flag
• Lithium energy source electrically disconnected until first power application to retain freshness
• Pin-for-pin compatible with other densities of DS174XP Timekeeping RAM

Real Time Clock Applications

• Systems requiring nonvolatile timekeeping and data storage
• Industrial equipment needing Y2K compliance
• Applications utilizing surface-mount assembly with replaceable PowerCap modules

Real Time Clock Procurement Notes

Verify that the required PowerCap (DS9034PCX+ or DS9034I-PCX+) is ordered separately, as it is not included with the DS1743WP-120+. Confirm the 34-pin PowerCap module board package type matches the target PCB footprint. Ensure the system operates within the specified 3.3V voltage range and commercial temperature limits.

Real Time Clock Selection Notes

Select this part for designs requiring a 3.3V supply and surface-mount RTC integration. The 120ns access speed suits standard microcontroller interfaces. Consider the DS1743P variant if a 5V supply is used, or the DIP module if through-hole mounting is preferred. Verify compatibility with existing DS174XP family pinouts for density upgrades.

Real Time Clock Part Context

This component belongs to the DS174XP series of Y2K-compliant nonvolatile timekeeping RAMs. It shares architectural similarities with the DS1743 and DS1746 families but is distinct in its 3.3V operation and PowerCap packaging. The 'W' suffix denotes the 3.3V version, while 'P' indicates the PowerCap module board package.

Real Time Clock Replacement Considerations

Direct substitutes include other DS1743 variants with different access times or voltages, such as DS1743P-100+ (5V) or DS1743W-120+ (DIP package). Ensure any replacement maintains the 8k x 8 capacity and RTC functionality. Verify that the PowerCap accessory remains compatible with the chosen package.