DS2431_12 Datasheet, PDF (1/27 Pages) Maxim Integrated Products – 1024-Bit, 1-Wire EEPROM

19-4675; Rev 12; 2/12
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
V_CC
μC
R_PUP
IO
DS2431
GND
Pin Configurations appear at end of data sheet.
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; Refer to the IC Data Sheet for
Details)
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+U
-40°C to +85°C 2 SFN (6mm x 6mm)
DS2431G+T&R
-40°C to +85°C
2 SFN (6mm x 6mm)
(2.5k pcs)
DS2431GA+U -40°C to +85°C 2 SFN (3.5mm x 6.5mm)
DS2431GA+T&R
-40°C to +85°C
2 SFN (3.5mm x 6.5mm)
(2.5k pcs)
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.
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.