DS1644-120

Real Time Clock Overview

The DS1644-120 is a Real-Time Clock (RTC) and Non-Volatile RAM (NVRAM) device manufactured by Analog Devices Inc. / Maxim Integrated. It integrates a calendar, clock, and NV timekeeping RAM into a single component. The device utilizes a parallel bus interface for data communication and supports a 24-hour HH:MM:SS time format. It operates within a supply voltage range of 4.5 V to 5.5 V and functions at temperatures between 0°C and +70°C. The package type is EDIP with through-hole mounting.

Real Time Clock Feature Summary

• Integrated Real-Time Clock with Calendar and NV Timekeeping RAM
• Parallel Bus Interface for Data Access
• EDIP Package with Through-Hole Mounting

Real Time Clock Applications

• Industrial systems requiring precise timekeeping
• Data logging equipment needing non-volatile storage
• Embedded controllers with parallel interface requirements

Real Time Clock Procurement Notes

Verify the specific manufacturer source, as the part is associated with both Maxim Integrated and Analog Devices Inc. due to corporate acquisition history. Confirm the exact package variant and lead times with authorized distributors, as availability may vary based on production status and regional restrictions.

Real Time Clock Selection Notes

Select this component when a combined RTC and NVRAM solution with a parallel interface is required. Ensure the system design supports the 4.5V to 5.5V operating voltage and the specified commercial temperature range. Verify that the parallel bus timing requirements align with the host microcontroller or processor capabilities.

Real Time Clock Part Context

This part belongs to the DS1644 series of real-time clocks and NVRAMs. It is distinct from similar models like the DS1742W-120, which features different memory capacities and voltage ranges. The DS1644-120 specifically denotes the 120ns access speed variant within the EDIP package family.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-referencing with datasheets for other DS1644 variants or DS1244 series components is recommended to verify pin compatibility and electrical specifications before substitution.