DS1743WP-150+

Real Time Clock Overview

The DS1743WP-150+ is a Y2K-compliant, nonvolatile timekeeping RAM integrating an 8k x 8 static RAM and a real-time clock/calendar. It operates at 3.3V with a 150ns access time in a 34-pin PowerCap module board package. The device features BCD-coded timekeeping registers with automatic leap year compensation valid through 2099. It includes integrated power-fail control circuitry that disables the device when VCC falls below the write-protection voltage (VPF). A lithium energy source provides over 10 years of data retention in the absence of main power.

Real Time Clock Feature Summary

• Integrated NV SRAM, RTC, crystal, power-fail control, and lithium battery
• BCD-coded century, year, month, date, day, hours, minutes, and seconds
• Automatic leap year compensation valid through 2099
• Power-fail write protection allows for ±10% VCC power-supply tolerance

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and data retention
• Embedded controllers needing nonvolatile storage with calendar functions
• Equipment requiring Y2K compliance and low-power backup

Real Time Clock Procurement Notes

Verify the specific ordering suffix to confirm the package type and voltage rating. The 'W' indicates a 3.3V EDIP or PowerCap variant, while 'P' denotes the 34-pin PowerCap module board. Ensure the separate PowerCap component (DS9034PCX+) is ordered if using the surface-mountable board version. Confirm RoHS compliance status based on the '+' suffix.

Real Time Clock Selection Notes

Select the DS1743WP-150+ for applications requiring 3.3V operation and surface-mount assembly via the PowerCap interface. This part requires the external DS9034PCX+ or DS9034I-PCX+ PowerCap containing the battery and crystal. For through-hole DIP integration with internal components, consider the DS1743W series instead.

Real Time Clock Part Context

The DS1743WP-150+ belongs to the DS1743/DS1743P family of Y2K-compliant nonvolatile timekeeping RAMs. It is designed to be pin-for-pin compatible with other densities in the DS174XP series. The PowerCap design separates the silicon from the battery and crystal to prevent thermal damage during solder reflow.

Real Time Clock Replacement Considerations

Direct substitutes include other DS1743 variants with different access times or voltages, such as DS1743WP-120+. Verify compatibility with the required PowerCap module (DS9034PCX+) for surface-mount implementations.