DS1743-100IND+

Real Time Clock Overview

The DS1743-100IND+ is a Y2K-compliant, nonvolatile timekeeping RAM integrating an RTC, NV SRAM, crystal, and lithium battery in a 28-pin EDIP module. It provides 8k x 8 static RAM with the top eight locations reserved for BCD-coded clock registers (century through seconds). The device operates at 5V with an industrial temperature range of -40°C to +85°C. It features automatic leap year compensation valid through 2099, power-fail write protection, and a low-battery indicator flag. Data retention exceeds 10 years without VCC.

Real Time Clock Feature Summary

• Integrated 8k x 8 NV SRAM with RTC registers in the top 8 memory locations
• BCD-coded time/date with automatic leap year correction valid through 2099
• Built-in lithium energy source providing over 10 years of data retention
• Power-fail write protection circuitry prevents data corruption during voltage drops

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing nonvolatile storage
• Embedded systems with strict Y2K compliance requirements
• Battery-backed real-time clock modules

Real Time Clock Procurement Notes

Verify the IND suffix confirms the -40°C to +85°C operating range. Confirm the package is the 28-pin EDIP module. Check RoHS compliance status as indicated by the '+' suffix. Note that this component may be subject to end-of-life restrictions or obsolescence notices from Analog Devices/Maxim Integrated.

Real Time Clock Selection Notes

Select the DS1743-100IND+ for applications requiring 8KB of nonvolatile memory alongside a calendar/clock function. Ensure the system supports 5V logic levels. For surface-mount designs, consider the PowerCap variant (DS1743P) instead. Verify that the parallel interface timing meets the microcontroller's access requirements.

Real Time Clock Part Context

This part belongs to the DS174x family of Y2K-compliant timekeeping RAMs. It is pin-compatible with other densities in the series, such as the DS1742 (2KB) and DS1746/DS1747 (larger capacities), allowing for density upgrades within the same footprint while maintaining identical register mapping for the clock functions.

Real Time Clock Replacement Considerations

Pin-compatible alternatives include the DS1742-100IND+ (2KB capacity) and higher-density parts like the DS1746 or DS1747. Surface-mount equivalents are available in the DS1743P series using the PowerCap connector.