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DS1211

Nonvolatile Controller X 8 Chip

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The DS1211 Nonvolatile Controller x8 Chip performs five circuit functions required to render standard CMOS RAM nonvolatile:

Monitor V_cc using a precise comparator that detects power-fail and inhibits chip-enable

Monitor battery status and warn the processor of low status

Switch power between a battery and V_cc, whichever is greater

Write-protect data

Provide for automatically switching between two batteries Power-fail detection occurs in the range of 4.75V to 4.5V with the tolerance Pin 3 grounded. If Pin 3 in connected to V_cco, then power-fail detection occurs in the range of 4.5 volts to 4.25 volts.

By combining the DS1211 nonvolatile controller/decoder chip and lithium batteries, nonvolatile RAM operation can be achieved for up to eight CMOS memories.

Data Sheet

Download	Rev 1	(PDF, 15kB)
E-Mail

Key Features

Controller circuitry with monitoring and logic functions to make CMOS RAM nonvolatile
Controls up to 8 memories
Monitors V_cc and write-protects when out of tolerance
Consumes less than 100nA battery current
Tests battery condition on power-up
Supports redundant batteries
Thermal operating ranges:
- DS1211: 0°C to +70°C
- DS1211-IND: -40° to +85°C
Voltage/tolerances: 5V ±5% or ±10%
Underwriters Laboratories (UL) Recognized

Key Specifications:

Non-Volatile RAM Controllers

Part Number

CE Cntrl.

Smart Socket w/Int. Batt.

Li Batt. Monitor

Pwr. Fail Out

RAMs Controlled

V_SUPPLY
(V)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

max w/pins

See Notes

DS1211

Yes

PDIP(N)/20

SOIC(W)/20

137.3

$13.61 @1k

See All Non-Volatile RAM Controllers (13)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Pin Assignment

Reliability Reports

Request Reliability Report for:
Underwriters Laboratories (UL) Recognized

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1211			Active	DS1211+	PDIP(N);20 pin;217.1 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P20-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1211+			Active		PDIP(N);20 pin;217.1 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P20+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1211N			Active	DS1211N+	PDIP(N);20 pin;217.1 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P20-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1211N+			Active		PDIP(N);20 pin;217.1 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P20+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1211S			Active	DS1211S+	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1211S+			Active		SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1211S+T&R			Active		SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1211S/T&R			Active	DS1211S+T&R	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1211S/T&R/C04			Active		SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1211SN			Active	DS1211SN+	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1211SN+			Active		SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1211SN+T&R			Active		SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1211SN/T&R			Active	DS1211SN+T&R	SOIC(W);20 pin;137.3 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0108 (PDF) Use pkgcode/variation: W20-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Rev 1; 1999-11-18
This page last modified: 2009-10-28