DS28E15

1-Wire SHA-256 Secure Authenticator

with 512-Bit User EEPROM

ABRIDGED DATA SHEET

General Description

The DS28E15 combines crypto-strong bidirectional

secure challenge-and-response authentication func-

tionality with an implementation based on the FIPS

180-3-specified Secure Hash Algorithm (SHA-256). A

512-bit user-programmable EEPROM array provides

nonvolatile storage of application data. Additional pro-

tected memory holds a read-protected secret for SHA-

256 operations and settings for memory protection

control. Each device has its own guaranteed unique

64-bit ROM identification number (ROM ID) that is fac-

tory programmed into the chip. This unique ROM ID is

used as a fundamental input parameter for cryptographic

operations and also serves as an electronic serial num-

ber within the application. A bidirectional security model

enables two-way authentication between a host system

and slave-embedded DS28E15. Slave-to-host authenti-

cation is used by a host system to securely validate that

an attached or embedded DS28E15 is authentic. Host-

to-slave authentication is used to protect DS28E15 user

memory from being modified by a nonauthentic host. The

bus at overdrive speed. The communication follows the

1-Wire protocol with the ROM ID acting as node address

in the case of a multidevice 1-Wire network.

Features

S

Symmetric-Key-Based Bidirectional Secure

Authentication Model Based on SHA-256

S

Strong Authentication with a High-Bit-Count User-

Programmable Secret and Input Challenge

S

512 Bits of User EEPROM Partitioned Into Two

Pages of 256 Bits

S

User-Programmable and Irreversible EEPROM

Protection Modes Including Authentication, Write

and Read Protect, and OTP/EPROM Emulation

S

Unique Factory-Programmed, 64-Bit Identification

Number

S

Single-Contact 1-Wire Interface

S

Operating Range: 3.3V ±10%, -40°C to +85°C

S

±8kV HBM ESD Protection (typ)

S

2-Pin SFN, 6-Pin TDFN-EP, and 6-Pin TSOC

Packages

Applications

Authentication of Consumables

Secure Feature Control

Typical Application Circuit

219-0018; Rev 0; 6/12

Ordering Information appears at end of data sheet.

1-Wire is a registered trademark of Maxim Integrated Products, Inc.

SDA

SCL

SLPZ

IO

3.3V

1-Wire LINE

µC

DS2465

DS28E15

#1

DS28E15

#2

DS28E15

#n

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.