DS1314E/T&R

Controllers Overview

The DS1314E/T&R is a nonvolatile memory controller in a 20-pin TSSOP package. It converts CMOS SRAM into nonvolatile memory by monitoring VCCI for out-of-tolerance conditions and automatically switching to a lithium battery backup supply upon power failure. The device features an open-drain Battery Warning output that signals low-battery conditions based on periodic loaded-voltage measurements. It includes an active-low Reset output to hold the processor during power failures and system power-up. Operating voltage ranges from 3.0V to 3.6V, with an industrial temperature range of -40°C to +85°C.

Controllers Feature Summary

• Converts standard CMOS SRAM into nonvolatile memory through automatic power-fail detection and seamless battery backup switching.
• Monitors lithium cell capacity via periodic loaded-voltage testing and asserts an open-drain warning signal when end-of-life approaches.
• Provides unconditional write protection by inhibiting chip enable outputs when the main supply voltage falls outside tolerance limits.

Controllers Applications

• Battery-backed SRAM modules requiring data retention during system power loss
• Processor-based systems needing reset signaling during power transients
• Industrial equipment utilizing lithium coin cells for long-term memory preservation

Controllers Procurement Notes

Verify the specific suffix 'T&R' indicates tape-and-reel packaging configuration. Confirm the 'E' designation corresponds to the 20-pin TSSOP variant with Reset functionality. Ensure compatibility with the target SRAM's voltage levels and interface requirements before procurement.

Controllers Selection Notes

Select this component when a 20-pin surface-mount solution is required for NVSRAM applications. The E variant provides essential Reset functionality absent in other pinouts. Verify that the system design accommodates the open-drain nature of the Battery Warning and Reset outputs requiring external pull-up resistors.

Controllers Part Context

This part belongs to the DS1314 family of nonvolatile controllers designed to protect SRAM data. The E suffix specifically denotes the 20-pin Thin Shrink Small-Outline Package (TSSOP) version. Unlike the 8-pin or 16-pin variants, this package includes a dedicated Reset output pin for processor control.

Controllers Replacement Considerations

DS1314S+ (16-SOIC)

Controllers FAQ

How does the DS1314E monitor battery health?

It periodically connects the battery to an internal 1.2 MΩ test resistor for one second every 24 hours. If the voltage drops below the trip point under this load, the Battery Warning pin activates.

What is the function of the Reset pin on the DS1314E?

The Reset pin goes active when VCCI falls below the tolerance threshold and remains active for approximately 200ms after power returns to prevent system operation during unstable power conditions.