DS3205 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

DS3205

Hot-Swappable Bus Buffer for I2C, SMBus, IPMI, and ATCA

Maxim Integrated 

Rev: 111607

DS3205

Hot-Swappable Bus Buffer for

I2C, SMBus, IPMI, and ATCA

General Description

The DS3205 bus buffer enables hot insertion and

extraction of boards without corruption of the

backplane’s 2-wire bus (I2C, SMBus™, IPMI, etc.).

When a board is inserted, the DS3205 presents high-

impedance SCL and SDA connections to the

backplane until VDD rises above 2.5V. During normal

operation, the DS3205 provides bidirectional

buffering to keep backplane and board capacitances

isolated.

Rise-time accelerators on each 2-wire bus pin enable

the use of lower current pullup resistors while still

meeting rise-time requirements.

Applications

Hot-Swappable Boards for AdvancedTCA®,

CompactPCI®, VME, and Other Backplanes in

Chassis-Oriented Telecom, Datacom,

Computing, and Storage Systems

Capacitance Buffer

Bus Extender

Fault Isolator

Ordering Information

PART

DS3205DN+

TEMP RANGE

PIN-

PACKAGE

-40°C to +85°C 14 TDFN

PKG

CODE

T1433-1

+Denotes a lead-free package.

Features

♦ Compliant to PICMG 3.0 IPMI I2C Requirements

♦ Bidirectional Buffer for SCL and SDA Lines

♦ Compatible with I2C, I2C Fast Mode, SMBus,

IPMI, and ATCA® Standards (Up to 400kHz)

♦ Prevents Corruption of System SCL and SDA

Lines During Live Insertion/Removal of Boards

♦ Increases Fanout by Connecting Board Bus to

Backplane Bus with < 10pF Additional Load

♦ Automatically Delays Initial Bus Connection

Until Both Bus Segments Are Idle

♦ SCL and SDA Pins High-Z When VDD = 0V

♦ 1V Precharge on SCL and SDA Lines

♦ ENABLE Input Pin Connects or Isolates Buses

♦ READY Output Pin Indicates “Connected”

♦ FAULT Output Pin Indicates “Stuck Bus”

♦ Optional Rise-Time Accelerators on All Bus

Pins

♦ Configurable Rise-Time Accelerator Slew Rate

Threshold (0.8V/μs or 1.25V/μs)

♦ Supports Clock Stretching and Multiple Bus

Master Arbitration and Synchronization

♦ Optionally Disconnects Board from Backplane

When Bus is Stuck Low for ≥ 30ms

♦ Optionally Attempts to Recover a Stuck Bus by

Clocking Board SCL

♦ ±15kV ESD Protection (Human Body Model) on

Bus Pins

♦ Wide Operating Voltage Range: 2.7V to 5.5V

♦ 5V Tolerant I/Os

♦ Tiny 14-Pin, 3mm x 3mm TDFN Package

SMBus is a trademark of Intel Corp.

ATCA, AdvancedTCA, and CompactPCI are registered trademarks of PCI Industrial Computer Manufacturers Group (PICMG).

Maxim Integrated Products 1

Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of

any device may be simultaneously available through various sales channels. For information about device errata, go to:

www.maxim-ic.com/errata. 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.

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