DS2465 Datasheet, PDF(1/31 Page) Maxim Integrated Products – SHA-256 Coprocessor with 1-Wire Master Function

ABRIDGED DATA SHEET

219-0017; Rev 0; 4/12

DS2465

SHA-256 Coprocessor with 1-Wire Master Function

General Description

The DS2465 is a SHA-256 coprocessor with built-in

1-WireÂ® master that provides the SHA-256 and memory

functionality required by a host system to communicate

with and operate a 1-Wire SHA-256 slave. In addition, it

performs protocol conversion between the I2C master

and any attached 1-Wire SHA-256 slaves. For 1-Wire line

driving, internal user-adjustable timers relieve the system

host processor from generating time-critical 1-Wire wave-

forms, supporting both standard and overdrive 1-Wire

communication speeds. The 1-Wire line can be powered

down under software control. Strong pullup features sup-

port 1-Wire power delivery to 1-Wire devices such as

EEPROMs. When not in use, the DS2465 can be put in

sleep mode where power consumption is minimal.

Applications

Authentication of Consumables

Secure Feature Control

Features

S SHA-256 Engine to Operate a Symmetric-Key-

Based Bidirectional Secure Authentication Model

S Two 32-Byte Pages of User EEPROM with Multiple

Programmable Protection Options

S 1-Wire Master Port with Selectable Active or

Passive 1-Wire Pullup

S Strong 1-Wire Pullup Provided by an Internal Low-

Impedance Signal Path

S 1-Wire Port Can Be Powered Down Under

Software Control

S I2C Operating (Pullup) Voltage: 3.3V Â±10%

S ESD Protection of Â±8kV HBM (typ) on 1-Wire IO

S Operating Range: 3.3V Â±10%, -40NC to +85NC

S 6-Pin TSOC Package

Ordering Information appears at end of data sheet.

Typical Application Circuit

(I2C PORT)

ÂµC

VCC

SDA

SCL

RP = 1.1kâ¦

MAXIMUM I2C BUS CAPACITANCE 320pF

DS2465

SLPZ

1-Wire LINE

DS28E15

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

For information on other Maxim products, visit Maximâs website at www.maxim-ic.com.

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