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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 86kB) Download   E-Mail

Description

The DS1212 Nonvolatile Controller x16 Chip performs five circuit functions required to render standard CMOS RAM nonvolatile: Monitor Vcc 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 Vcc, 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 Vcco, then power-fail detection occurs in the range of 4.5V to 4.25V. By combining the DS1212 nonvolatile controller/decoder chip with lithium batteries, nonvolatile RAM operation can be achieved for up to 16 CMOS memories.

Key Features

Controller circuitry with monitoring and logic functions to make CMOS RAM nonvolatile Controls up to 16 memories Monitors Vcc 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: DS1212: 0°C to +70°C DS1212-IND: -40° to +85°C Voltage/power-fail tolerances: 5V ±5% or ±10% Underwriters Laboratories (UL®) Recognized

Diagram

Pin Assignment

Reliability Reports

Request Reliability Report for: DS1212 Underwriters Laboratories (UL®) Recognized

Software/Models

none

Ordering Information

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. More: SeeFull Data Sheet or Part 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.

Devices: 1-5 of 5

DS1212	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1212			Active	PDIP(W);28 pin;592.6 mm² Outline Drawing: 21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1212+			Active	PDIP(W);28 pin;592.6 mm² Outline Drawing: 21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1212N			Active	PDIP(W);28 pin;592.6 mm² Outline Drawing: 21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1212Q			Active	PLCC;28 pin;158 mm² Outline Drawing: 21-0049 (PDF) Land Pattern: 90-0235 (PDF) Use pkgcode/variation: Q28-4*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1212QN			Active	PLCC;28 pin;158 mm² Outline Drawing: 21-0049 (PDF) Land Pattern: 90-0235 (PDF) Use pkgcode/variation: Q28-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

More Information

UL Certified

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