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DS3050W-100

3.3V Single-Piece 4Mb Nonvolatile SRAM with Clock

Maxim Integrated 

Rev 0; 4/05

3.3V Single-Piece 4Mb Nonvolatile SRAM

with Clock

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.

Whenever VCC 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 VCC is

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

POS Terminals

Industrial Controllers

Data-Acquisition Systems

Gaming

Fire Alarms

PLCs

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

SRAM when VCC is Out-of-Tolerance

♦ Automatically Switches to Battery Supply when

VCC Power Failures Occur

♦ 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

Ordering Information

PART

DS3050W-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

Typical Operating Circuit

CE

WR

RD

CS

MICROPROCESSOR

OR DSP DATA

ADDRESS

INT

INT

8 BITS

19 BITS

CE

WE

OE

CS

DS3050W

512k x 8

DQ0–7 NV SRAM

AND RTC

A0–18

IRQ/FT

RST

Pin Configuration appears at end of data sheet.

______________________________________________ Maxim Integrated Products 1

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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