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REV: 082203

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

FEATURES

§ Real-time clock (RTC) keeps track of hundredths

of seconds, seconds, minutes, hours, days, date,

months, and years with automatic leap-year

compensation valid up to the year 2100

§ 2M x 8 NV SRAM

§ Watch function is transparent to RAM operation

§ Automatic data protection during power loss

§ Unlimited write-cycle endurance

§ Surface-mountable BGA module construction

§ Over 10 years of data retention in the absence of

power

§ Battery monitor checks remaining capacity daily

§ +3.3V or +5V operation

APPLICATIONS

Telecom Switches

Routers

RAID Systems

TYPICAL OPERATING CIRCUIT

PACKAGE OUTLINE

ORDERING INFORMATION

PART

PIN-

PACKAGE

TEMP

RANGE

TOP

MARK

DS1254WB-

150

BGA, 3.3V

0°C to +70°C

DS1254W-

150

DS1254YB-

100

BGA, 5V

0°C to +70°C

DS1254Y-

100

DS1254WB2-

150

BGA, 3.3V

0°C to +70°C

DS1254W2-

150

DS1254YB2-

100

BGA, 5V

0°C to +70°C

DS1254Y2-

100

PIN DESCRIPTION

- Supply Voltage

A0–A20

- Address Inputs

DQ0–DQ7

- Data I/O

CE

- Chip-Enable Input

OE

- Output-Enable Input

WE

- Write-Enable Input

BW

- Battery Warning Output

(Open Drain)

GND

- Ground

DS1254

2M x 8 NV SRAM with Phantom Clock

www.maxim-ic.com

Side -A- Shown

(For Reference Only, Not to Scale)

Component placement may vary.