Maxim > Products > 1-Wire Devices > DS28E25
Maxim > Products > Embedded Security > DS28E25
Maxim > Products > Memory > DS28E25

DS28E25

DeepCover Secure Authenticator with 1-Wire SHA-256 and 4Kb User EEPROM

Protect Your Development Investment with Crypto-Strong Authentication and Advanced Physical Security

Overview

Design Resources

Ordering Info

Status

Active: In Production.

Description

DeepCover^® embedded security solutions cloak sensitive data under multiple layers of advanced physical security to provide the most secure key storage possible.

The DeepCover Secure Authenticator (DS28E25) combines secure challenge-and-response authentication functionality based on the FIPS 180-3-specified Secure Hash Algorithm (SHA-256) with 4Kb of user-programmable EEPROM. Additional secure memory holds a secret/key for SHA-256 operations. Each device has its own guaranteed unique 64-bit ROM identification number (ROM ID) that is factory programmed into the chip. The SHA-256 message authentication code (MAC), which the DS28E25 generates, is computed from data in the user memory, the SHA-256 secret, a host controller random challenge, and the 64-bit ROM ID. A secure and low-cost factory-programming service is available to pre-program device data including the SHA-256 secret. The DS28E25 communicates over Maxim's single-contact 1-Wire^® bus.

To enable subtitles, start the video then click the CC button.
Overview of Maxim's secure authenticators

Data Sheet

ABRIDGED DATA SHEET

Download	Rev 3	(PDF, 556.8kB)

Request Full Data Sheet Custom Order

Key Features

Symmetric-Key-Based Bidirectional Secure Authentication Model Based on SHA-256
Sophisticated Die-Level Methods and Circuits for Tamper Protection of Sensitive Data and Signals
Dedicated Hardware-Accelerated SHA Engine for Generating SHA-256 MACs
Strong Authentication with a High Bit Count, User-Programmable Secret, and Input Challenge
4096 Bits of User EEPROM Partitioned Into 16 Pages of 256 Bits
User-Programmable and Irreversible EEPROM Protection Modes Including Authentication, Write and Read Protect, and OTP/EPROM Emulation
Unique, Factory-Programmed 64-Bit Identification Number
Single-Contact 1-Wire Interface Communicates with Host at Up to 76.9kbps
Operating Range: 3.3V ±10%, -40°C to +85°C
±8kV HBM ESD Protection (typ)
2-Pin SFN, 2-Pin TO-92, 6-Pin TDFN, and 6-Pin TSOC Packages

Applications/Uses

Identification and authentication of consumables
Reference Design License Management
Sensor/Accessory Authentication and Calibration
System Intellectual Property Protection

Key Specifications:

Memory (EPROM, EEPROM, ROM, NV SRAM)

Part Number

Memory Type

Memory Size

Bus Type

Real Time Clock

DIP w/Int. Batt.

Pwr. Cap Pckg.

Battery Monitor

GPIO

V_SUPPLY
(V)

min

max

DS28E25

EEPROM

4K x 1

1-Wire

2.97

3.63

See All Memory (EPROM, EEPROM, ROM, NV SRAM) (68)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Application Circuit

More Information

New Product Press Release

[ 2012-12-05 ]

Didn't Find What You Need?

Information Index

Overview		Design Resources		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Technical Documents Evaluation Kits Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 219-0019 Rev 3; 2013-01-29
This page last modified: 2013-04-09