DS2045Y-70#【PDF 1/12 页】IC NVSRAM 1MBIT 70NS 256BGA

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Sheet目录322

[1页]2页 3页 4页 5页

Rev 4; 10/06

DS2045Y/AB Single-Piece 1Mb

Nonvolatile SRAM

General Description

Features

The DS2045 is a 1Mb reflowable nonvolatile (NV) SRAM,

o Single-Piece, Reflowable,

27mm 2

PBGA Package

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

troller, and an internal rechargeable manganese lithium

(ML) battery. These components are encased in a sur-

face-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. Two versions of the

DS2045 are available, which provide either a 5% or 10%

power-monitoring trip point. The DS2045 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

at 5% or 10% Below Nominal V CC (5V)

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

Gaming

Router/Switches

POS Terminals

Data-Acquisition Systems

Fire Alarms

PLC

Pin Configuration appears at end of data sheet.

Ordering Information

PART

DS2045AB-70#

DS2045AB-100#

DS2045Y-70#

DS2045Y-100#

TEMP RANGE

-40 ° C to +85 ° C

PIN-PACKAGE

256 Ball 27mm 2 BGA Module

SPEED (ns)

100

SUPPLY TOLERANCE

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

Typical Operating Circuit

P4.0

P3.6

P3.7

(CE0)

(WR)

(RD)

DS2045

8051

AD0–AD7

8 BITS

DQ0–7

128k x 8

MICROPROCESSOR

NV SRAM

P1.0–7

P4.4

P2.0–7

P3.2

(INT0)

8 BITS

A0–7

A16

A8–15

RST

______________________________________________ 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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