DS3045W-100#【PDF 1/18 页】IC NVSRAM 1MBIT 100NS 256BGA

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Sheet目录323

[1页]2页 3页 4页 5页

Rev 2; 10/06

3.3V Single-Piece 1Mb Nonvolatile SRAM

with Clock

General Description

The DS3045W consists of a static RAM, a nonvolatile

(NV) controller, a year 2000-compliant real-time clock

(RTC), 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 clock and SRAM from the

external power source, and allows the contents of the

clock registers or SRAM to be modified. When V CC is

powered down or out-of-tolerance, the controller write-

protects the memory contents and powers the clock

and SRAM from the battery. The DS3045W also con-

tains a power-supply monitor output ( RST ), as well as a

user-programmable interrupt output ( IRQ /FT).

Applications

Features

o Single-Piece, Reflowable, 27mm x 27mm BGA

Package Footprint

o Internal Manganese Lithium Battery and Charger

o Integrated Real-Time Clock

o Unconditionally Write-Protects the Clock and

SRAM when V CC is Out-of-Tolerance

o Automatically Switches to Battery Supply when

V CC Power Failures Occur

o Reset Output can be Used as a CPU Supervisor

o Interrupt Output can be Used as a CPU Watchdog

RAID Systems and Servers

POS Terminals

Industrial Controllers

Data-Acquisition Systems

Gaming

Fire Alarms

PLCs

Routers/Switches

Timer

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

o UL Recognized

Ordering Information

PART

DS3045W-100#

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

256-ball 27mm x 27mm BGA Module

SPEED

100ns

SUPPLY VOLTAGE

3.3V ±0.3V

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

Typical Operating Circuit

OR DSP

MICROPROCESSOR

DATA

8 BITS

DQ0–7

DS3045W

128k x 8

NV SRAM

AND RTC

ADDRESS

INT

Pin Configuration appears at end of data sheet.

17 BITS

A0–16

IRQ/FT

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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