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Maxim’s memory products consist of specialized memory featuring the 1-wire interface, as well as static RAM and non-volatile RAM controllers..

Our 1-Wire memory devices combine memory, mixed-signal, and secure authentication functions through a single-contact serial interface. Our NVSRAM devices feature fast reads/writes and the endurance of SRAM with the convenience of nonvolatile multiple memory configurations and package options. Our NVRAM Controllers convert CMOS RAM into nonvolatile memory while optionally integrating time keeping functions.

Also See:

1-Wire Devices

DS28E05 1-Wire EEPROM
The DS28E05 is a 112-byte user-programmable EEPROM organized as 7 pages of 16 bytes each. Memory...
  • Single-Contact 1-Wire Interface
  • 112 Bytes User EEPROM with 1K Write Cycles
  • Programmable Write Protection and OTP EPROM Emulation Modes for User Memory
  • Unique Factory-Programmed 64-Bit ROM ID Number
  • Communicates with Host at Up to 76.9kbps (Overdrive Only)
  • Operating Range: 1.71V to 3.63V, -40°C to +85°C
  • ±8kV HBM ESD Protection (typ) on IO Pin
  • 4-Ball UCSP, 2-Pad SFN, 3-Pin SOT23 and 6-Pin TSOC Packages
DS28E80 Gamma Radiation Resistant 1-Wire Memory
The DS28E80 is a user-programmable nonvolatile memory chip. In contrast to the floating-gate sto...
  • High Gamma Resistance Allows User-Programmable Manufacturing or Calibration Data Before Medical Sterilization
    • Resistant Up to 75kGy (kiloGray) of Gamma Radiation
    • Reprogrammable 248 Bytes of User Memory
  • Lower Block Size Provides Greater Flexibility in Programming User Memory
    • Memory is Organized as 8-Byte Blocks
    • Each Block Can Be Written 8 Times
    • User-Programmable Write Protection for Individual Memory Blocks
  • Advanced 1-Wire Protocol Minimizes Interface to Just Single Contact
  • Compact Package and Single IO Interface Reduces Board Space and Enhances Reliability
    • Unique Factory-Programmed, 64-Bit Identification Number
    • Communicates at 1-Wire Standard Speed (15.3kbps max) and Overdrive Speed (76kbps max)
    • Operating Range: 3.3V ±10%, -40°C to + 85°C Reading, 0°C to +50°C Writing
    • ±8kV HBM ESD Protection (typ) for IO Pin
    • 6-Pin TDFN Package
DS28EC20 20Kb 1-Wire EEPROM
The DS28EC20 is a 20480-bit, 1-Wire® EEPROM organized as 80 memory pages of 256 bits each. An ad...
  • 20480 Bits of Nonvolatile (NV) EEPROM Partitioned into Eighty 256-Bit Pages
  • Individual 8-Page Groups of Memory Pages (Blocks) can be Permanently Write Protected or Put in OTP EPROM-Emulation Mode ("Write to 0")
  • Read and Write Access Highly Backward-Compatible to Legacy Devices (e.g., DS2433)
  • 256-Bit Scratchpad with Strict Read/Write Protocols Ensures Integrity of Data Transfer
  • 200k Write/Erase Cycle Endurance at +25°C
  • Unique Factory-Programmed 64-Bit Registration Number Ensures Error-Free Device Selection and Absolute Part Identity
  • Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise
  • Communicates to Host at 15.4kbps or 90kbps Using 1-Wire Protocol
  • Low-Cost TO-92 Package
  • Operating Range: 4V to 5.25V, -40°C to +85°C
  • Operating Range: 3.135V to3.465V, 0°C to +70°C (Standard Speed only)
  • IEC 1000-4-2 Level 4 ESD Protection (±8kV Contact, ±15kV Air, Typical) for I/O Pin
DS28E07 1024-Bit, 1-Wire EEPROM
The DS28E07 is a 1024-bit, 1-Wire® EEPROM chip organized as four memory pages of 256 bits each. ...
  • Partitioning of Memory Provides Greater Flexibility in Programming User Data
    • 1024 Bits of EEPROM Memory Organized as Four Pages of 256 Bits
    • Individual Memory Pages Can Be Permanently Write Protected or Put in EPROM-Emulation Mode (Write to 0)
  • Advanced 1-Wire Protocol Minimizes Interface to Just Single IO Reducing Required Pin Count and Enhancing Reliability
    • Unique Factory-Programmed, Unalterable 64-Bit Identification Number
    • Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise
    • Communicates to Host with a Single Digital Signal at 15.4kbps or 125kbps Using 1-Wire Protocol
    • Reads and Writes over a Wide Voltage Range from 3.0V to 5.25V from -40°C to +85°C
    • ±8kV HBM ESD Protection (typ) for IO Pin
DS2401 Silicon Serial Number
The DS2401 enhanced Silicon Serial Number is a low-cost, electronic registration number that pro...
  • Guaranteed Unique 64-Bit ROM ID Chip for Absolute Traceability
    • Unique, Factory-Lasered and Tested 64-Bit Registration Number (8-Bit Family Code +48-Bit Serial Number + 8-Bit CRC Tester)
    • 8-Bit Family Code Specifies DS2401 Communications Requirements to Reader
  • Minimalist 1-Wire® Interface Lowers Cost and Interface Complexity
    • Multiple DS2401 Devices Can Reside on a Common 1-Wire Net
    • Built-In Multidrop Controller Ensures Compatibility with Other 1-Wire Net Products
    • Reduces Control, Address, Data, and Power to a Single Pin and Communicates at Up to 16.3kbps
    • Presence Pulse Acknowledges When the Reader First Applies Voltage
    • Low-Cost TO-92, SOT-223, and TSOC Surface-Mount Packages
    • TO-92 Tape-and-Reel Version with Leads Bent to 100-mil Spacing (Default) or with Straight Leads (DS2401-SL)
  • Wide Voltage and Temperature Operating Ranges Enables Robust System Performance
    • Extended 2.8V to 6.0V Range
    • Zero Standby Power Required
    • -40°C to +85°C Industrial Temperature Range
DS9122QA Socket Adapters for DS9488-GP8 Multi-Device Programmer
The DS9122 socket adapters are used in conjunction with the DS9488-GP8 to program a subset of Ma...
  • Enable Programming of Up to 8 Devices In a Single Session
  • ESD-sensitive components
  • Status LEDs Provide Immediate Pass/Fail Confirmation
DS9122Q Socket Adapters for DS9488-GP8 Multi-Device Programmer
The DS9122 socket adapters are used in conjunction with the DS9488-GP8 to program a subset of Ma...
  • Enable Programming of Up to 8 Devices In a Single Session
  • ESD-sensitive components
  • Status LEDs Provide Immediate Pass/Fail Confirmation
DS9122P Socket Adapters for DS9488-GP8 Multi-Device Programmer
The DS9122 socket adapters are used in conjunction with the DS9488-GP8 to program a subset of Ma...
  • Enable Programming of Up to 8 Devices In a Single Session
  • ESD-sensitive components
  • Status LEDs Provide Immediate Pass/Fail Confirmation
DS9122 Multi-Device Programmer for 1-Wire and I2C Devices
DS9488-GP8 Description The DS9488-GP8 multi-device programmer for 1-Wire® and I2C devices simult...
DS9488-GP8 Multi-Device Programmer for 1-Wire and I2C Devices
DS9488-GP8 Description The DS9488-GP8 multi-device programmer for 1-Wire® and I2C devices simult...
DS2408 1-Wire 8-Channel Addressable Switch
The DS2408 is an 8-channel, programmable I/O 1-Wire® chip. PIO outputs are configured as open-dr...
  • Control Eight Independent I/O Port Pins from a Single Micro Port Pin
    • Eight Channels of Programmable I/O with Open-Drain Outputs
    • On-Resistance of PIO Pulldown Transistor 100Ω (max); Off-Resistance 10MΩ (typ)
    • Individual Activity Latches Capture Asynchronous State Changes at PIO Inputs for Interrogation by the Bus Master
    • Data-Strobe Output to Synchronize PIO Logic States to External Read/Write Circuitry
  • Minimalist 1-Wire Interface Lowers Cost and Interface Complexity
    • Built-in Multidrop Controller Ensures Compatibility with Other 1-Wire® Net Products
    • Supports 1-Wire Conditional Search Command with Response Controlled by Programmable PIO Conditions
    • Unique Factory-Lasered 64-Bit Registration Number Ensures Error-Free Device Selection and Absolute Part Identity
    • Communicates to Host with a Single Digital Signal at 15.3kbps or 100kbps
  • Wide Voltage and Temperature Operating Ranges Enables Robust System Performance
    • 2.8V to 5.25V
    • -40°C to +85°C Industrial Temperature Range
DS2502 1Kb Add-Only Memory
The DS2502 1Kb Add-Only Memory identifies and stores relevant information about the product to w...
  • Easily Add Traceability and Relevant Information to Any Individual System
    • 1k-Bit EPROM with Page-Level Write Protection and Guaranteed Unique 64-Bit ROM ID Chip for Absolute Traceability
    • 1024 Bits Electrically Programmable Read Only Memory (EPROM)
    • Unique, Factory-Lasered and Tested 64-Bit Registration Number (8-Bit Family Code + 48-Bit Serial Number + 8-Bit CRC Tester)
    • EPROM Partitioned into Four 256-Bit Pages for Randomly Accessing Packetized Data
    • Each Memory Page Can Be Permanently Write- Protected to Prevent Tampering
    • Device is an Add Only Memory Where Additional Data Can Be Programmed into EPROM Without Disturbing Existing Data
    • Architecture Allows Software to Patch Data by Superseding an Old Page in Favor of a Newly Programmed Page
    • 8-Bit Family Code Specifies DS2502 Communications Requirements to Reader
  • Minimalist 1-Wire Interface Lowers Cost and Interface Complexity
    • Reduces Control, Address, Data, Power, and Programming Signals to a Single Data Pin
    • Directly Connects to a Single Port Pin of a Microprocessor and Communicates at up to 16.3kb Per Second
    • Built-In Multidrop Controller Ensures Compatibility with Other 1-Wire Net Products o Presence Pulse Acknowledges When the Reader First Applies Voltage
    • Low Cost TO-92, SFN, or 8-Pin SO, SOT-23 (3 Pin), TSOC and WLP Surface Mount Package
  • Wide Voltage and Temperature Operating Ranges Provide Robust System Performance
    • Reads Over Voltage Range of 2.8V to 6.0V at -40°C to +85°C
    • Zero Standby Power Required
    • Programs at 11.5V to 12.0V from -40°C to +50°C
DS2431 1024-Bit 1-Wire EEPROM
The DS2431 is a 1024-bit, 1-Wire® EEPROM chip organized as four memory pages of 256 bits each. D...
  • Easily Add Traceability and Relevant Information to Any Individual System
    • 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
  • Minimalist 1-Wire Interface Lowers Cost and Interface Complexity
    • IEC 1000-4-2 Level 4 ESD Protection (±8kV Contact, ±15kV Air, typ)
    • 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
DS2432 1Kb Protected 1-Wire EEPROM with SHA-1 Engine
The DS2432 combines 1024 bits of EEPROM, a 64-bit secret, an 8-byte register/control page with u...
  • 1128 Bits of 5V EEPROM Memory Partitioned Into Four Pages of 256 Bits, a 64-Bit Write-Only Secret, and Up to Five General-Purpose Read/Write Registers
  • On-Chip 512-Bit ISO/IEC 10118-3 SHA-1 Engine to Compute 160-Bit Message Authentication Codes (MACs) and to Generate Secrets
  • Write Access Requires Knowledge of the Secret and the Capability of Computing and Transmitting a 160-Bit MAC as Authorization
  • Secret and Data Memory Can Be Write Protected (All or Page 0 Only) or Put in EPROM-Emulation Mode ("Write to 0", Page 1)
  • Unique, Factory-Lasered and Tested 64-Bit Registration Number Assures Absolute Traceability Because No Two Parts Are Alike
  • Built-In Multidrop Controller Ensures Compatibility with Other 1-Wire® Net Products
  • Reduces Control, Address, Data, and Power to a Single Data Pin
  • Directly Connects to a Single Port Pin of a Microprocessor and Communicates at Up to 15.3kbps
  • Overdrive Mode Boosts Communication Speed to 90.9kbps
  • Low-Cost 6-Lead TSOC Surface-Mount Package or Solder-Bumped UCSP™ Package
  • Reads and Writes Over a Wide Voltage Range of 2.8V to 5.25V from -40°C to +85°C
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DS24B33 1-Wire 4Kb EEPROM
The DS24B33 is a 4096-bit, 1-Wire® EEPROM organized as 16 memory pages of 256 bits each. Data is...
  • 4096 Bits of Nonvolatile EEPROM Partitioned Into Sixteen 256-Bit Pages
  • Read and Write Access is Highly Backward-Compatible to the DS2433
  • 256-Bit Scratchpad with Strict Read/Write Protocols Ensures Integrity of Data Transfer
  • Unique, Factory-Programmed, 64-Bit Registration Number Ensures Error-Free Device Selection and Absolute Part Identity
  • Switchpoint Hysteresis to Optimize Performance in the Presence of Noise
  • Communicates to Host at 15.4kbps or 125kbps Using 1-Wire Protocol
  • Low-Cost Through-Hole and SMD Packages
  • Operating Range: +2.8V to +5.25V, -40°C to +85°C
  • IEC 1000-4-2 Level 4 ESD Protection (±8kV Contact, ±15kV Air, Typical) for IO Pin
DS2430A 256-Bit 1-Wire EEPROM
The DS2430A 256-bit 1-Wire® EEPROM identifies and stores relevant information about the product ...
  • 256-bit Electrically Erasable Programmable Read Only Memory (EEPROM) plus 64-bit one-time programmable application register
  • Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute identity because no two parts are alike
  • Built-in multidrop controller ensures compatibility with other MicroLAN products
  • EEPROM organized as one page of 32 bytes for random access
  • Reduces control, address, data, and power to a single data pin
  • Directly connects to a single port pin of a microprocessor and communicates at up to 15.3kbits per second
  • 8-bit family code specifies DS2430A communication requirements to reader
  • Presence detector acknowledges when reader first applies voltage
  • Low cost TO-92 or 6-pin TSOC and UCSP surface mount package
  • Reads and writes over a wide voltage range of 2.8V to 5.25V from -40°C to +85°C
DS1972 iButton 1024-Bit EEPROM
The iButton® 256-bit EEPROM (DS1972) is a 1024-bit, 1-Wire® EEPROM chip in a rugged iButton pack...
  • 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 of 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
DS2411 Silicon Serial Number with VCC Input
The DS2411 silicon serial number is a low-cost, electronic registration number with external pow...
  • Unique, Factory-Lasered and Tested 64-Bit Registration Number (8-Bit Family Code Plus 48-Bit Serial Number Plus 8-Bit CRC Tester); Guaranteed No Two Parts Alike
  • Standby Current <1µA
  • Built-In Multidrop Controller Enables Multiple DS2411s to Reside on a Common 1-Wire Network
  • Multidrop Compatible with Other 1-Wire Products
  • 8-Bit Family Code Identifies Device as DS2411 to the 1-Wire Master
  • Low-Cost TSOC, SOT23-3, and Flip-Chip Surface-Mount Packages
  • Directly Connects to a Single-Port Pin of a Microprocessor and Communicates at up to 15.4kbps
  • Overdrive Mode Boosts Communication Speed to 125kbps
  • Operating Range: 1.5V to 5.25V, -40°C to +85°C
DS28E04-100 4096-Bit Addressable 1-Wire EEPROM with PIO
The DS28E04-100 is a 4096-bit, 1-Wire® EEPROM chip with seven address inputs. The address inputs...
  • 4096 bits of EEPROM Memory Partitioned into 16 Pages of 256 Bits
  • Seven Address Inputs for Physical Location Configuration
  • Two General-Purpose PIO Pins with Pulse-Generation Capability
  • Individual Memory Pages can be Permanently Write-Protected or put in OTP EPROM Emulation Mode ("Write to 0")
  • Communicates to Host with a Single Digital Signal at 15.3kbps or 111kbps Using 1-Wire Protocol
  • Parasitic or VCC Powered
  • Conditional Search Based on PIO Status or PIO Activity
  • Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise
  • Reads and Writes Over a Wide 2.8V to 5.25V Voltage Range from -40°C to +85°C
  • 16-Pin, 150-mil SO Package
DS1992 iButton 1Kb/4Kb Memory
The iButton® 1Kb/4Kb memory (DS1992) is a rugged read/write data carrier that act as a localized...
  • 4096 bits of Read/Write Nonvolatile Memory (DS1993)
  • 1024 bits of Read/Write Nonvolatile Memory (DS1992)
  • 256-bit Scratchpad Ensures Integrity of Data Transfer
  • Memory Partitioned into 256-bit Pages for Packetizing Data
  • Data Integrity Assured with Strict Read/Write Protocols
  • Operating Temperature Range from -40°C to +70°C
  • Over 10 years of data retention
  • Unique, Factory-Lasered and Tested 64-bit Registration Number (8-bit Family Code + 48-bit Serial Number + 8-bit CRC Tester) Assures Absolute Traceability Because No Two Parts are Alike
  • Multidrop Controller for MicroLAN
  • Digital Identification and Information by Momentary Contact
  • Chip-Based Data Carrier Compactly Stores Information
  • Data Can be Accessed While Affixed to Object
  • Economically Communicates to Bus Master with a Single Digital Signal at 16.3kbps
  • Standard 16mm Diameter and 1-Wire Protocol Ensure Compatibility with iButton Family
  • Button Shape is Self-Aligning with Cup-Shaped Probes
  • Durable Stainless Steel Case Engraved with Registration Number Withstands Harsh Environments
  • Easily Affixed with Self-Stick Adhesive Backing, Latched by its Flange, or Locked with a Ring Pressed onto its Rim
  • Presence Detector Acknowledges When Reader First Applies Voltage
  • Meets UL 913, 5th Ed., Rev. 1997-02-24; Intrinsically Safe Apparatus, Approved under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations