Linear Technology Electronic Components Datasheet

LTC4305CGN Datasheet

2-Wire Bus Multiplexer

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LTC4305 www.DataSheet4U.com

2-Channel,

2-Wire Bus Multiplexer with

Capacitance Buffering

FEATURES

■ 1:2 2-Wire Multiplexer/Switch

■ Connect SDA and SCL Lines with 2-Wire Bus

Commands

■ Supply Independent Bidirectional Buffer for SDA

and SCL Lines Increases Fan-Out

■ Programmable Disconnect from Stuck Bus

■ Compatible with I2C and SMBus Standards

■ Rise Time Accelerator Circuitry

■ SMBus Compatible ALERT Response Protocol

■ Prevents SDA and SCL Corruption During Live Board

Insertion and Removal from Backplane

■ ±10kV Human Body Model ESD Ruggedness

■ 16-Lead (4mm × 5mm) DFN and SSOP Packages

APPLICATIO S

■ Nested Addressing

■ 5V/3.3V Level Translator

■ Capacitance Buffer/Bus Extender

DESCRIPTIO

The LTC®4305 is a 2-channel, 2-wire bus multiplexer with

bus buffers to provide capacitive isolation between the

upstream bus and downstream buses. Through software

control, the LTC4305 connects the upstream 2-wire bus

to any desired combination of downstream channels.

Each channel can be pulled up to a supply voltage ranging

from 2.2V to 5.5V, independent of the LTC4305 supply

voltage. The downstream channels are also provided with

an ALERT1–ALERT2 inputs for fault reporting.

Programmable timeout circuitry disconnects the down-

stream buses if the bus is stuck low. When activated, rise

time accelerators source currents into the 2-wire bus pins

to reduce rise time. Driving the ENABLE pin low restores

all features to their default states. Three address pins

provide 27 distinct addresses.

The LTC4305 is available in 16-lead (4mm × 5mm) DFN

and SSOP packages.

, LTC and LT are registered trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners. Patent Pending.

TYPICAL APPLICATIO

A Level-Shifting and Nested Addressing Application

2.5V

3.3V

0.01µF

MICRO-

CONTROLLER

10k 10k 10k

VCC

SCLIN

SCL1

SDAIN SDA1

ALERT ALERT1

LTC4305

10k 10k 10k

SFP

MODULE #1

ADDRESS = 1111 000

ADR2

10k

ADR1

SCL2

ADR0

SDA2

GND

ALERT2

4305 TA01

ADDRESS = 1000 100

10k 10k

SFP

MODULE #2

ADDRESS = 1111 000

VCC = 3.3V

SCLIN

2V/DIV

SCL1

2V/DIV

SCL2

2V/DIV

I2C Bus Waveforms

VBACK = 2.5V

VCARD1 = 3.3V

VCARD2 = 5V

500ns/DIV

4305 TA01b

4305f

Linear Technology Electronic Components Datasheet

LTC4305CGN Datasheet

2-Wire Bus Multiplexer

No Preview Available !

LTC4305

www.DataSheet4U.com

ABSOLUTE AXI U RATI GS (Note 1)

Supply Voltage (VCC) ................................... –0.3V to 7V

Input Voltages (ADR0, ADR1, ADR2,

ENABLE, ALERT1, ALERT2) .................... –0.3V to 7V

Output Voltages (ALERT, READY) ............... –0.3V to 7V

Input/Output Voltages (SDAIN, SCLIN,

SCL1, SDA1, SCL2, SDA2) ...................... –0.3V to 7V

Output Sink Current (SDAIN, SCLIN, SCL1,

SDA1, SCL2, SDA2, ALERT, READY) ............... 10mA

Operating Temperature Range

LTC4305C ............................................... 0°C to 70°C

LTC4305I ............................................. –40°C to 85°C

Storage Temperature Range

DHD Package .................................... –65°C to 125°C

GN Package ....................................... –65°C to 150°C

Lead Temperature (Soldering, 10 sec)

GN Package ...................................................... 300°C

UW U

PACKAGE/ORDER I FOR ATIO

TOP VIEW

ALERT2 1

ALERT 2

SDAIN 3

GND 4

SCLIN 5

ENABLE 6

VCC 7

ADRO 8

16 SCL2

15 SDA2

14 ALERT1

13 SDA1

12 SCL1

11 READY

10 ADR2

9 ADR1

DHD PACKAGE

16-LEAD (4mm × 5mm) PLASTIC DFN

EXPOSED PAD (PIN 17) PCB CONNECTION OPTIONAL

MUST BE CONNECTED TO PCB TO OBTAIN

θJA = 43°C/W OTHERWISE θJA = 140°C/W. TJMAX = 125°C

ORDER PART NUMBER DHD PART MARKING

TOP VIEW

ALERT2 1

ALERT 2

SDAIN 3

GND 4

SCLIN 5

ENABLE 6

VCC 7

ADR0 8

16 SCL2

15 SDA2

14 ALERT1

13 SDA1

12 SCL1

11 READY

10 ADR2

9 ADR1

GN PACKAGE

16-LEAD NARROW PLASTIC SSOP

TJMAX = 125°C, θJA = 135°C/W

ORDER PART NUMBER

GN PART MARKING

LTC4305CDHD

4305

LTC4305IDHD

4305

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marketing: http://www.linear.com/leadfree/

Consult LTC Marketing for parts specified with wider operating temperature ranges.

LTC4305CGN

LTC4305IGN

4305

4305I

ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full specified temperature

range, otherwise specifications are at TA = 25°C. VCC = 3.3V unless otherwise noted.

SYMBOL

PARAMETER

Power Supply/Start-Up

VCC

Input Supply Range

ICC

Input Supply Current

ICC ENABLE = 0V

VUVLOU

VUVLOHYST

Input Supply Current

UVLO Upper Threshold Voltage

UVLO Threshold Hysteresis Voltage

CONDITIONS

MIN TYP MAX UNITS

●

2.7

5.5

Downstream Connected, VCC = 5.5V ●

SCL Bus Low, SDA Bus High

5.2

VENABLE = 0V, VCC = 5.5V

●

1.25 2.5

●

2.3

2.5

2.7

● 100 175 250

4305f

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LTC4305CGN Datasheet

2-Wire Bus Multiplexer

LTC4305CGN Datasheet

2-Wire Bus Multiplexer

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