General Description

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

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.

ML battery, powers the SRAM from the external power

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

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

RAID Systems and Servers

POS Terminals

Industrial Controllers

Data-Acquisition Systems

Gaming

Fire Alarms

Router/Switches

PLC

Features

Footprint

♦ Internal ML Battery and Charger

is Out-of-Tolerance

♦ Automatically Switches to Battery Supply when

♦ Internal Power-Supply Monitor Detects Power Fail

♦ Reset Output can be used as a CPU Supervisor

for a Microprocessor

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

♦ UL Recognized

DS2045Y/AB Single-Piece 1Mb

Nonvolatile SRAM

______________________________________________ Maxim Integrated Products

1

Rev 2; 1/05

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 (ns)

SUPPLY TOLERANCE (%)

DS2045AB-70

-40°C to +85°C

70

5

DS2045AB-100

-40°C to +85°C

100

5

DS2045Y-70

-40°C to +85°C

70

10

DS2045Y-100

-40°C to +85°C

100

10

Typical Operating Circuit

P4.0

P3.6

P3.7

P1.0–7

AD0–AD7

P4.4

P2.0–7

P3.2

RST

A8–15

A0–7

A16

DQ0–7

OE

WE

CE

8 BITS

8 BITS

8 BITS

(CE0)

(INT0)

8051

MICROPROCESSOR

DS2045

128k x 8

NV SRAM

(WR)

(RD)