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REV: 050704

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

GENERAL DESCRIPTION

The DS2431 is a 1024-bit, 1-Wire

®

EEPROM chip

organized 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

communicates

over

the

single-

conductor 1-Wire bus. The communication follows

the standard Dallas Semiconductor 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/PC Board 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

µC

I/O

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)

!

Reads and Writes Over a Wide Voltage Range of

2.8V to 5.25V from -40°C to +85°C

!

Communicates to Host with a Single Digital

Signal at 15.4kbps or 111kbps Using 1-Wire

Protocol

ORDERING INFORMATION

PART

TEMP RANGE

PIN-PACKAGE

DS2431

-40°C to 85°C

TO-92

DS2431/T&R

-40°C to 85°C

TO-92, tape & reel

DS2431P

-40°C to 85°C

TSOC

DS2431P/T&R

-40°C to 85°C

TSOC, tape & reel

DS2431X

-40°C to 85°C

CSP, tape & reel

PIN CONFIGURATION

1

2

3

1

2

3

TO-92

TSOC, Top View

1

2

3

6

5

4

TSOC, TO-92 pinout:

Pin 1 -------------

GND

Pin 2 -------------

I/O

All other pins --

NC

CSP, approx. 68

× 68 mil

Top view, bumps not visible

A

B

2

1

A1 = NC

A2 = I/O

B1 = NC

B2 = GND

DS2431

1024-Bit 1-Wire EEPROM

www.maxim-ic.com

Commands, Registers, and Modes are capitalized for

clarity.

1-Wire is a registered trademark of Dallas Semiconductor Corp.