DS1321+ by Analog Devices

Flexible Nonvolatile Controller with Lithium Battery


The DS1321 Flexible Nonvolatile Controller with Lithium Battery Monitor is a CMOS circuit which solves the application problem of converting CMOS SRAMs into nonvolatile memory. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip enable outputs are inhibited to accomplish write protection and the battery is switched on to supply the SRAMs with uninterrupted power. Special circuitry uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery consumption. One DS1321 can support as many as four SRAMs arranged in any of three memory configurations. In addition to battery-backup support, the DS1321 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 DS1321 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.

Where to Buy

Prices starting from US$8.42

Distributor Stock
Logo for Farnell
Farnell
from US$8.42
No stock
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Logo for Newark Electronics
Newark Electronics
from US$9.17
-
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Logo for element14
element14
from US$8.77
-
Buy Now

Features

Converts CMOS SRAM into nonvolatile memory
Unconditionally write-protects SRAM when VCC is out of tolerance
Automatically switches to battery backup supply when VCC power failure occurs
Flexible memory organization Mode 0: 4 banks with 1 SRAM each Mode 1: 2 banks with 2 SRAMs each Mode 2: 1 bank with 4 SRAMs each
Mode 0: 4 banks with 1 SRAM each
Mode 1: 2 banks with 2 SRAMs each
Mode 2: 1 bank with 4 SRAMs each
Monitors voltage of a lithium cell and provides advanced warning of impending battery failure
Signals low-battery condition on active low Battery Warning output signal
Resets processor when power failure occurs and holds processor in reset during system power-up
Optional 5% or 10% power-fail detection
16-pin PDIP, 16-pin SO and 20-pin TSSOP packages
Industrial temperature range of -40°C to +85°C

Specifications

CE Cntrl. Yes
Smart Socket w/Int. Batt. No
Li Batt. Monitor Yes
Pwr. Fail Out Yes
RAMs Controlled 4
VSUPPLY (V) 5
Package/Pins PDIP/16SOIC (N)/16TSSOP/20
Oper. Temp. (°C) -40 to +85
BudgetaryPrice (See Notes) 6.44


DS1321+ - Integrated Circuits by Analog Devices

NV CONTROLLER W/ BATTERY MONITOR DIP-16

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

IC Function Nonvolatile Controller with Lithium Battery Monitor
Supply Voltage Min 4.75V
Supply Voltage Max 5.5V
IC Package Type DIP
No. of Pins 16Pins
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

Nv Controller W/ Battery Monitor, Dip-16 | Newark Electronics
NV CONTROLLER W/ BATTERY MONITOR, DIP-16 | element14

Frequently Asked Questions

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Is the DS1321+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

Which authorised distributors for DS1321+ have stock available?

Authorised distributors including Newark Electronics, element14 and Farnell have stock available or on a lead time for DS1321+ .

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