DS1643AL-120

Real Time Clock Overview

The DS1643AL-120 is a Real-Time Clock (RTC) and Nonvolatile Timekeeping RAM module manufactured by Analog Devices Inc./Maxim Integrated. It integrates a calendar, clock, and 8 kB of static RAM with parallel interface access. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports time formats including HH:MM:SS. It features through-hole mounting in an eDIP-28 package and functions reliably across an operating temperature range of 0°C to +70°C.

Real Time Clock Feature Summary

• Integrated Real-Time Clock with Calendar and NV Timekeeping RAM
• 8 kB Parallel Static RAM Interface
• Through-Hole eDIP-28 Package
• Operating Temperature Range: 0°C to +70°C

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing nonvolatile storage
• Telecommunications infrastructure monitoring
• Embedded systems with parallel bus architectures

Real Time Clock Procurement Notes

Verify component authenticity due to potential availability from secondary markets. Confirm package integrity and pin alignment for the eDIP-28 form factor. Check manufacturing date codes against project lifecycle requirements as this part may be subject to obsolescence status. Ensure supply chain documentation matches Analog Devices specifications.

Real Time Clock Selection Notes

Select this component when a parallel interface RTC with substantial onboard memory is required. Compare against serial alternatives if pin count reduction is necessary. Verify that the 4.5V to 5.5V supply range aligns with system power rails. Consider the physical dimensions of the eDIP-28 module for PCB layout constraints.

Real Time Clock Part Context

This part belongs to the DS1643 family of real-time clocks and NVRAM modules. It shares functional similarities with other Maxim Integrated RTCs but is distinguished by its specific 8 kB capacity and parallel bus compatibility. The 'AL' suffix typically denotes specific temperature or package variations within the broader product line.

Real Time Clock Replacement Considerations

Direct replacements are limited due to the specific parallel interface and memory size. Evaluate DS1643 variants with different speed grades or packages. Serial RTCs require significant firmware and hardware redesign. Consult official cross-reference lists for verified equivalents.