DS2050W-100#【PDF 1/12 页】IC NVSRAM 4MBIT 100NS 256BGA

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Sheet目录322

[1页]2页 3页 4页 5页

Rev 2; 10/06

DS2050W 3.3V Single-Piece 4Mb

Nonvolatile SRAM

General Description

Features

The DS2050W is a 4Mb reflowable nonvolatile (NV)

o Single-Piece, Reflowable,

27mm 2

PBGA Package

SRAM, which consists of a static RAM (SRAM), an NV

controller, and an internal rechargeable manganese

lithium (ML) battery. These components are encased in

a surface-mount module with a 256-ball BGA footprint.

Whenever V CC is applied to the module, it recharges the

ML battery, powers the SRAM from the external power

source, and allows the contents of the SRAM to be mod-

ified. When V CC is powered down or out-of-tolerance,

the controller write-protects the SRAM’s contents and

powers the SRAM from the battery. The DS2050W also

contains a power-supply monitor output, RST , which can

be used as a CPU supervisor for a microprocessor.

Applications

Footprint

o Internal ML Battery and Charger

o Unconditionally Write-Protects SRAM when V CC

is Out-of-Tolerance

o Automatically Switches to Battery Supply when

V CC Power Failures Occur

o Internal Power-Supply Monitor Detects Power Fail

Below Nominal V CC (3.3V)

o Reset Output can be Used as a CPU Supervisor

for a Microprocessor

o Industrial Temperature Range (-40 ° C to +85 ° C)

o UL Recognized

RAID Systems and Servers

Industrial Controllers

POS Terminals

Routers/Switches

Data-Acquisition Systems

Gaming

Fire Alarms

PLC

Pin Configuration appears at end of data sheet.

Ordering Information

PART

DS2050W-100#

TEMP RANGE

-40 ° C to +85 ° C

PIN-PACKAGE

256 Ball 27mm 2 BGA Module

SPEED (ns)

100

SUPPLY TOLERANCE

3.3V ±0.3V

# Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements.

Typical Operating Circuit

(CE)

(WR)

(RD)

DS2050W

MICROPROCESSOR

OR DSP

DATA

ADDRESS

(INT)

8 BITS

19 BITS

DQ0–7

A0–18

RST

512k x 8

NV SRAM

______________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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