DS1743-70

Real Time Clock Overview

The DS1743-70 is a Y2K-compliant, nonvolatile timekeeping RAM integrating an 8k x 8 static RAM and a real-time clock/calendar. It features a bytewide parallel interface where RTC registers occupy the eight top RAM locations. The device includes an integrated crystal, lithium energy source, and power-fail control circuit. It supports BCD-coded time and date with automatic leap year compensation valid through 2099. Operating at 5V, it provides over 10 years of data retention without power. The component is housed in a 28-pin encapsulated DIP module.

Real Time Clock Feature Summary

• Integrated NV SRAM (8KB), RTC, crystal, and lithium battery
• BCD-coded time/date with automatic leap year compensation
• Power-fail write protection and low-battery indicator flag
• Pin-compatible with other DS174XP densities

Real Time Clock Applications

• Industrial systems requiring precise timekeeping
• Data logging equipment needing nonvolatile storage
• Embedded controllers with parallel memory interfaces

Real Time Clock Procurement Notes

Verify the specific suffix for voltage and temperature range, as '70' is not listed in the official ordering table. Confirm RoHS compliance status via the datasheet revision history. Check for available direct replacements due to potential end-of-life status.

Real Time Clock Selection Notes

Select based on required supply voltage (5V or 3.3V) and operating temperature range. Ensure the system utilizes a parallel interface compatible with the standard JEDEC pinout. Verify that the 8KB capacity meets the application's storage needs alongside the RTC functionality.

Real Time Clock Part Context

The DS1743 belongs to the Maxim Integrated DS174XP family of nonvolatile timekeeping RAMs. It offers pin-for-pin compatibility with other densities in the series, allowing for design flexibility. The device combines memory and clock functions into a single package to simplify board layout.

Real Time Clock Replacement Considerations

Direct substitutes include other members of the DS174XP family such as the DS1744 or DS1745, which share the same interface and pinout but offer different memory capacities.