General Description

The DS3050W 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.

the ML battery, powers the clock and SRAM from the

external power source, and allows the contents of the

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

protects the memory contents and powers the clock

and SRAM from the battery. The DS3050W also con-

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

user-programmable interrupt output (IRQ/FT).

Applications

RAID Systems and Servers

Gaming

POS Terminals

Fire Alarms

Industrial Controllers

PLCs

Data-Acquisition Systems

Routers/Switches

Features

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

Package Footprint

♦ Internal Manganese Lithium Battery and Charger

♦ Integrated Real-Time Clock

♦ Unconditionally Write-Protects the Clock and

♦ Automatically Switches to Battery Supply when

♦ Reset Output can be Used as a CPU Supervisor

♦ Interrupt Output can be Used as a CPU Watchdog

Timer

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

♦ UL Recognized

3.3V Single-Piece 4Mb Nonvolatile SRAM

with Clock

______________________________________________ Maxim Integrated Products

1

CE

DATA

ADDRESS

INT

RST

A0–18

DQ0–7

CE

19 BITS

8 BITS

MICROPROCESSOR

OR DSP

DS3050W

512k x 8

NV SRAM

AND RTC

WR

WE

RD

OE

INT

IRQ/FT

CS

CS

Typical Operating Circuit

Rev 0; 4/05

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.

Ordering Information

Pin Configuration appears at end of data sheet.

PART

TEMP RANGE

PIN-PACKAGE

SPEED

SUPPLY VOLTAGE (%)

DS3050W-100

-40°C to +85°C

256-ball 27mm x 27mm BGA Module

100ns

3.3V ±0.3V