Maxim > Products > 1-Wire Devices > DS28E01-100
Maxim > Products > Embedded Security > DS28E01-100


1Kb Protected 1-Wire EEPROM with SHA-1 Engine

Provides Low-Cost, World-Class Secure Authentication of Peripherals and Systems
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Status Explanations for product status codes

Active: In Production.


The DS28E01-100 combines 1024 bits of EEPROM with challenge-and-response authentication security implemented with the ISO/IEC 10118-3 Secure Hash Algorithm (SHA-1). The 1024-bit EEPROM array is configured as four pages of 256 bits with a 64-bit scratchpad to perform write operations. All memory pages can be write protected, and one page can be put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state. Each DS28E01-100 has its own guaranteed unique 64-bit ROM registration number that is factory lasered into the chip. The DS28E01-100 communicates over the single-contact 1-Wire® bus. The communication follows the standard 1-Wire protocol with the registration number acting as the node address in the case of a multidevice 1-Wire network.

Data Sheet

Download this datasheet in PDF formatDownload Rev 8 (PDF, 287.4kB)
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An evaluation board is available: DS28E01PMOD DSAUTHSK

Key Features

  • 1024 Bits of EEPROM Memory Partitioned Into Four Pages of 256 Bits
  • On-Chip 512-Bit SHA-1 Engine to Compute 160-Bit Message Authentication Codes (MAC) and to Generate Secrets
  • Write Access Requires Knowledge of the Secret and the Capability of Computing and Transmitting a 160-Bit MAC as Authorization
  • User-Programmable Page Write Protection for Page 0, Page 3, or All Four Pages Together
  • User-Programmable OTP EPROM Emulation Mode for Page 1 ("Write to 0")
  • Communicates to Host with a Single Digital Signal at 15.3kbps or 90.9kbps Using 1-Wire Protocol
  • Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise
  • Reads and Writes Over a Wide Voltage Range of 2.8V to 5.25V from -40°C to +85°C
  • 6-Lead TSOC and TDFN or 2-Lead TO-92 and SFN Packages


  • Accessory/PCB Identification
  • Identification and authentication of consumables
  • Ink and Toner Print Cartridge Identification
  • Intellectual Property, License Management
  • Sensor Calibration and Authentication
  • System Programmable Feature Control

Key Specifications:

Part Number Memory Type Memory Size Bus Type Real Time Clock DIP w/Int. Batt. Pwr. Cap Pckg. Battery Monitor GPIO VSUPPLY
min max
DS28E01-100  EEPROM 1K x 1 1-Wire No No No No No 2.8 5.25
See All Memory (EPROM, EEPROM, ROM, NV SRAM) (66)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

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Information Index

Document Ref.: 219-0007 Rev 8; 2012-10-08
This page last modified: 2012-10-08