DS1321E+T&R

Controllers Overview

The DS1321E+T&R is a flexible nonvolatile memory controller with an integrated lithium battery monitor, designed to convert CMOS SRAMs into nonvolatile memory. It operates within a supply voltage range of 4.75V to 5.5V and supports an industrial temperature range from -40°C to +85°C. The device features four independent chip enable outputs to manage up to four SRAM banks in various configurations. It includes a low-leakage CMOS process for precise voltage detection and battery monitoring, ensuring data integrity during power failures.

Controllers Feature Summary

• Converts standard CMOS SRAMs into nonvolatile memory by automatically switching to battery backup upon power failure.
• Monitors lithium battery capacity and signals impending end-of-life via an open-drain warning output.
• Provides processor reset functionality during power failures and holds the system in reset until power stabilizes.

Controllers Applications

• Battery-backed memory systems requiring data retention during power outages
• Industrial control systems needing reliable nonvolatile storage
• Embedded applications utilizing multiple SRAM banks

Controllers Procurement Notes

Verify the specific package type and RoHS compliance status against the manufacturer's current ordering information. Confirm that the T&R suffix indicates tape and reel packaging suitable for automated assembly processes. Ensure compatibility with existing PCB footprints for the 20-pin TSSOP configuration before procurement.

Controllers Selection Notes

Select this component when designing systems that require seamless transition between main power and battery backup for SRAM data preservation. Consider the available memory organization modes to match the specific SRAM array requirements. Evaluate the thermal characteristics and operating temperature range to ensure suitability for the intended environmental conditions.

Controllers Part Context

This part belongs to the DS1321 family of flexible nonvolatile controllers manufactured by Analog Devices / Maxim Integrated. It shares core functionalities with other variants in the series but is distinguished by its 20-pin TSSOP surface-mount package. The family is designed to provide robust power management and battery monitoring solutions for nonvolatile memory applications.

Controllers Replacement Considerations

Direct replacements include the DS1321S+ (16-pin SO) and DS1321+ (16-pin PDIP), which offer identical electrical specifications but differ in physical package dimensions. Verify pinout compatibility and board space constraints when substituting these variants.