DS2431
1024-Bit 1-Wire EEPROM
www.maxim-ic.com
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.
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FEATURES
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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
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
ORDERING INFORMATION
PART
DS2431
DS2431/T&R
DS2431P
DS2431P/T&R
DS2431X
TEMP RANGE
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
PIN-PACKAGE
TO-92
TO-92, tape & reel
TSOC
TSOC, tape & reel
CSP, tape & reel
TYPICAL OPERATING CIRCUIT
V
CC
R
PUP
PIN CONFIGURATION
1
TO-92
2
3
6
5
4
TSOC, Top View
µC
I/O
DS2431
GND
TSOC, TO-92 pinout:
Pin 1 -------------
GND
Pin 2 -------------
I/O
All other pins --
NC
2
1
2
2
3
3
1
A
B
A1 = NC
A2 = I/O
B1 = NC
B2 = GND
Commands, Registers, and Modes are capitalized for
clarity.
1-Wire is a registered trademark of Dallas Semiconductor Corp.
1
CSP, approx. 68
×
68 mil
Top view, bumps not visible
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.
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REV: 050704
DALLAS [ DALLAS SEMICONDUCTOR ]
