DS1321S+ 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$5.18

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Newark Electronics
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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


DS1321S+ Semiconductors - ICs by Analog Devices

CONTROLLER CMOS SRAM 5V 16SOIC

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

Specifications

Memory Controller Type Nonvolatile SRAM
Voltage Tolerance ± 10%
Supply Voltage Min 4.5V
Supply Voltage Max 5.5V
Controller IC Case Style SOIC
No. of Pins 16Pins
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)
Operating Temperature Range -40°C to +85°C
Supply Voltage Range 4.5V to 5.5V

Alternative Descriptions

Flexible Nonvolatile Controlle | Analog Devices
Controller, Cmos Sram, 5V, 16Soic | Newark Electronics
CONTROLLER, CMOS SRAM, 5V, 16SOIC | element14

Frequently Asked Questions

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Is the DS1321S+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

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Authorised distributors including Analog Devices, Newark Electronics, element14 and Farnell have stock available or on a lead time for DS1321S+ .

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