19-4675; Rev 7; 6/09
1024-Bit, 1-Wire EEPROM
DS2431
General Description
Features
♦ 1024 Bits of EEPROM Memory Partitioned Into
®
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.
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 ( 8ꢀk
Contact, 15ꢀk ꢁir, ꢂypical)
♦ Reads and Writes Over a Wide koltage Range
from 2.8k to 5.25k from -40°C to +85°C
♦ Communicates to Host with a Single Digital
Signal at 15.4ꢀbps or 125ꢀbps Using 1-Wire
Protocol
Applications
Accessory/PCB Identification
♦ ꢁlso ꢁvailable as ꢁutomotive kersion Meeting
ꢁEC-Q100 Grade 1 Qualification Requirements
(DS2431-ꢁ1)
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+
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C 3 TO-92
-40°C to +85°C 3 TO-92
-40°C to +85°C 6 TSOC
-40°C to +85°C 6 TSOC
-40°C to +85°C 2 SFN
DS2431+T&R
DS2431P+
Typical Operating Circuit
DS2431P+T&R
DS2431G+
V
CC
DS2431G+T&R -40°C to +85°C 2 SFN
6 TDFN-EP* (2.5k pcs)
-40°C to +85°C 3x3 UCSPR (2.5k pcs)
-40°C to +85°C 3x3 UCSPR (10k pcs)
R
PUP
DS2431Q+T&R -40°C to +85°C
DS2431X+S
DS2431X+
IO
DS2431
μC
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.
GND
*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.