DS2431 1024-Bit, 1-Wire EEPROM General Description Benefits and Features The DS2431 is a 1024-bit, 1-Wire EEPROM chip orga- Easily Add Traceability and Relevant Information to nized as four memory pages of 256 bits each. Data is Any Individual System written to an 8-byte scratchpad, verified, and then copied 1024 Bits of EEPROM Memory Partitioned Into to the EEPROM memory. As a special feature, the four Four Pages of 256 Bits memory pages can individually be write protected or Individual Memory Pages Can Be Permanently put in EPROM-emulation mode, where bits can only be Write Protected or Put in EPROM-Emulation Mode changed from a 1 to a 0 state. The DS2431 communi- (Write to 0) cates over the single-conductor 1-Wire bus. The com- Switchpoint Hysteresis and Filtering to Optimize munication follows the standard 1-Wire protocol. Each Performance in the Presence of Noise device has its own unalterable and unique 64-bit ROM Minimalist 1-Wire Interface Lowers Cost and registration number that is factory lasered into the chip. Interface Complexity The registration number is used to address the device in IEC 1000-4-2 Level 4 ESD Protection a multidrop, 1-Wire net environment. (8kV Contact, 15kV Air, typ) Reads and Writes Over a Wide Voltage Range Applications from 2.8V to 5.25V from -40C to +85C Accessory/PCB Identification Communicates to Host with a Single Digital Signal Medical Sensor Calibration Data Storage at 15.4kbps or 125kbps Analog Sensor Calibration Including IEEE P1451.4 Smart Sensors Ink and Toner Print Cartridge Identification Ordering Information After-Market Management of Consumables PART TEMP RANGE PIN-PACKAGE DS2431+ -40C to +85C 3 TO-92 Typical Operating Circuit DS2431+T&R -40C to +85C 3 TO-92 DS2431P+ -40C to +85C 6 TSOC V CC DS2431P+T&R -40C to +85C 6 TSOC R PUP DS2431G+U -40C to +85C 2 SFN (6mm x 6mm) IO 2 SFN (6mm x 6mm) DS2431G+T&R -40C to +85C (2.5k pcs) DS2431 C DS2431GA+U -40C to +85C 2 SFN (3.5mm x 6.5mm) 2 SFN (3.5mm x 6.5mm) DS2431GA+T&R -40C to +85C (2.5k pcs) GND DS2431Q+T&R -40C to +85C 6 TDFN-EP* (2.5k pcs) DS2431X-S+ -40C to +85C 3x3 UCSPR (2.5k pcs) DS2431X+ -40C to +85C 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, Pin Configurations appear at end of data sheet. refer to the package outline drawing. +Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. *EP = Exposed pad. 19-4675 Rev 16 5/21DS2431 1024-Bit, 1-Wire EEPROM Absolute Maximum Ratings IO Voltage Range to GND........................................-0.5V to +6V Lead Temperature (excluding UCSP, soldering, 10s).......+300C IO Sink Current....................................................................20mA Soldering Temperature (reflow) Operating Temperature Range.............................-40C to +85C TO-92............................................................................+250C Junction Temperature........................................................+150C AIl other packages, excluding SFN...............................+260C Storage Temperature Range..............................-55C to +125C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (T = -40C to +85C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IO PIN: GENERAL DATA 1-Wire Pullup Voltage V (Note 2) 2.8 5.25 V PUP 1-Wire Pullup Resistance R (Notes 2, 3) 0.3 2.2 k PUP Input Capacitance C (Notes 4, 5) 1000 pF IO Input Load Current I IO pin at V 0.05 6.7 A L PUP V - PUP High-to-Low Switching Threshold V (Notes 5, 6, 7) 0.5 V TL 1.8 Input Low Voltage V (Notes 2, 8) 0.5 V IL V - PUP Low-to-High Switching Threshold V (Notes 5, 6, 9) 1.0 V TH 1.0 Switching Hysteresis V (Notes 5, 6, 10) 0.21 1.70 V HY Output Low Voltage V At 4mA (Note 11) 0.4 V OL Standard speed, R = 2.2k 5 PUP Recovery Time Overdrive speed, R = 2.2k 2 PUP t s REC (Notes 2,12) Overdrive speed, directly prior to reset 5 pulse R = 2.2k PUP Standard speed 0.5 5.0 Rising-Edge Hold-Off Time (Notes t s REH 5, 13) Overdrive speed Not applicable (0) Standard speed 65 Time Slot Duration t s SLOT (Notes 2, 14) Overdrive speed 8 IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE Standard speed 480 640 Reset Low Time (Note 2) t s RSTL Overdrive speed 48 80 Standard speed 15 60 Presence-Detect High Time t s PDH Overdrive speed 2 6 Standard speed 60 240 Presence-Detect Low Time t s PDL Overdrive speed 8 24 Standard speed 60 75 Presence-Detect Sample Time t s MSP (Notes 2, 15) Overdrive speed 6 10 Maxim Integrated 2 www.maximintegrated.com