DS1312 - Maxim Integrated

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

DS1312
Manufacturer

Maxim Integrated
ChipWorker Part#

CW135052166
Category

Memory Chip
Package

DIP-8
Description

The DS1312 Nonvolatile Controller with Battery Monitor is a CMOS circuit which solves the application problem of converting CMOS RAM into nonvolatile memory
Documentation

Datasheet

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DS1312 Specifications

Attribute	Attribute Value

Part Number	DS1312
Manufacturer	Maxim Integrated
ChipWorker Part#	CW135052166
Category	Memory Chip
Documentation	Datasheet
Mounting Style	Through Hole
Number of Pins	8 Pin
Case/Package	DIP-8
Supply Voltage (DC)	5.50V (max)
Operating Temperature (Max)	85 ℃
Operating Temperature (Min)	-40 ℃
Supply Voltage	4.75V ~ 5.5V
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Size-Length	8.84 mm
Size-Width	6.1 mm
Size-Height	3.18 mm
Operating Temperature	-40℃ ~ 85℃
Product Lifecycle Status	Unknown
Packaging	Tube
RoHS	Non-Compliant
Lead-Free Status	Contains Lead

Product Description

Description
The DS1312 Nonvolatile Controller with Battery Monitor is a CMOS circuit which solves the application problem of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip enable is inhibited to accomplish write protection and the battery is switched on to supply the RAM with uninterrupted power. Special circuitry uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery consumption.
In addition to battery-backup support, the DS1312 performs the important function of monitoring the remaining capacity of the lithium battery and providing a warning before the battery reaches end-of-life. Because the open-circuit voltage of a lithium backup battery remains relatively constant over the majority of its life, accurate battery monitoring requires loaded-battery voltage measurement. The DS1312 performs such measurement by periodically comparing the voltage of the battery as it supports an internal resistive load with a carefully selected reference voltage. If the battery voltage falls below the reference voltage under such conditions, the battery will soon reach end-of-life. As a result, the Battery Warning pin is activated to signal the need for battery replacement.

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