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DS2431

1024-Bit, 1-Wire EEPROM

Maxim Integrated 

19-4675; Rev 7; 6/09

1024-Bit, 1-Wire EEPROM

General Description

The DS2431 is a 1024-bit, 1-Wire® EEPROM chip orga-

nized as four memory pages of 256 bits each. Data is

written to an 8-byte scratchpad, verified, and then

copied to the EEPROM memory. As a special feature, the

four memory pages can individually be write protected or

put in EPROM-emulation mode, where bits can only be

changed from a 1 to a 0 state. The DS2431 communi-

cates over the single-conductor 1-Wire bus. The commu-

nication follows the standard 1-Wire protocol. Each

device has its own unalterable and unique 64-bit ROM

registration number that is factory lasered into the chip.

The registration number is used to address the device in

a multidrop, 1-Wire net environment.

Applications

Accessory/PCB Identification

Medical Sensor Calibration Data Storage

Analog Sensor Calibration Including IEEE

P1451.4 Smart Sensors

Ink and Toner Print Cartridge Identification

After-Market Management of Consumables

Typical Operating Circuit

VCC

μC

RPUP

IO

DS2431

GND

Features

♦ 1024 Bits of EEPROM Memory Partitioned Into

Four Pages of 256 Bits

♦ Individual Memory Pages Can Be Permanently

Write Protected or Put in EPROM-Emulation Mode

(“Write to 0”)

♦ Switchpoint Hysteresis and Filtering to Optimize

Performance in the Presence of Noise

♦ IEC 1000-4-2 Level 4 ESD Protection (±8kV

Contact, ±15kV Air, Typical)

♦ Reads and Writes Over a Wide Voltage Range

from 2.8V to 5.25V from -40°C to +85°C

♦ Communicates to Host with a Single Digital

Signal at 15.4kbps or 125kbps Using 1-Wire

Protocol

♦ Also Available as Automotive Version Meeting

AEC-Q100 Grade 1 Qualification Requirements

(DS2431-A1)

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

DS2431+

-40°C to +85°C 3 TO-92

DS2431+T&R -40°C to +85°C 3 TO-92

DS2431P+

-40°C to +85°C 6 TSOC

DS2431P+T&R -40°C to +85°C 6 TSOC

DS2431G+

-40°C to +85°C 2 SFN

DS2431G+T&R -40°C to +85°C 2 SFN

DS2431Q+T&R -40°C to +85°C 6 TDFN-EP* (2.5k pcs)

DS2431X+S

-40°C to +85°C 3x3 UCSPR (2.5k pcs)

DS2431X+

-40°C to +85°C 3x3 UCSPR (10k pcs)

Note: The leads of TO-92 packages on tape and reel are

formed to approximately 100-mil (2.54mm) spacing. For

details, refer to the package outline drawing.

+Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

*EP = Exposed pad.

Pin Configurations appear at end of data sheet.

1-Wire is a registered trademark of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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