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 parallel interface with standard JEDEC bytewide pinout. The device operates on a 5V supply within a commercial temperature range of 0°C to +70°C. Timekeeping data is stored in BCD format across eight uppermost RAM locations, including century, year, month, date, day, hours, minutes, and seconds. The component includes automatic leap year compensation valid through 2099 and a low-battery-voltage indicator flag.

Real Time Clock Feature Summary

• Integrated NV SRAM (8KB), RTC, crystal, power-fail control, and lithium energy source
• BCD-coded time/date registers with automatic leap year compensation through 2099
• Power-fail write protection allows for ±10% VCC power-supply tolerance
• Lithium energy source electrically disconnected until first power application

Real Time Clock Applications

• Systems requiring Y2K-compliant real-time clock and nonvolatile memory
• Industrial equipment needing battery-backed timekeeping and data retention
• Embedded controllers utilizing standard JEDEC static RAM pinouts

Real Time Clock Procurement Notes

Verify the specific suffix (+) indicates lead-free/RoHS compliance. Confirm the PowerCap module (DS9034PCX+) is ordered separately as it is not included with the DS1743P-100+. Check current lifecycle status as these devices may be discontinued or subject to product change notices.

Real Time Clock Selection Notes

Select the DS1743P-100+ for surface-mount applications requiring a 34-pin PowerCap module board. Ensure the system design accommodates the separate mounting of the PowerCap containing the battery and crystal after surface-mount assembly to prevent thermal damage. Verify compatibility with 5V logic levels and parallel bus architecture.

Real Time Clock Part Context

The DS1743P-100+ belongs to the DS174x family of Y2K-compliant nonvolatile timekeeping RAMs. It is pin-for-pin compatible with other densities in the series, such as the DS1742 and DS1643 variants. The 'P' designation specifically denotes the 34-pin PowerCap module board package, distinct from the 28-pin EDIP DIP module.

Real Time Clock Replacement Considerations

Pin-for-pin compatible alternatives within the same family include the DS1743-100+ (28-pin EDIP) and DS1743W-120+ (3.3V variant). For direct functional replacement in surface-mount designs, verify availability of the corresponding PowerCap accessory.