Interface I2C and SMBus Bus Buffers and Accelerators

LTM2883 - SPI/Digital or I2C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power
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LTC4312 - Pin-Selectable, 2-Channel, 2-Wire Multiplexer with Bus Buffers

LTC4305 - 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

Typical Application

LTC4305 Typical Application
LTC4305 Typical Application

Description

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 downstream 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC4305CDHD#PBF 5x4 DFN-16 DHD C 05-08-1707 Yes
LTC4305CDHD#TRPBF 5x4 DFN-16 DHD C 05-08-1707 Yes
LTC4305CGN#PBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC4305CGN#TRPBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC4305IDHD#PBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC4305IDHD#TRPBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC4305IGN#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC4305IGN#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes


LTC4305 Package Drawing
LTC4305 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC4305CDHD#PBF 5x4 DFN-16 C $4.07 $2.85 Yes
LTC4305CDHD#TRPBF 5x4 DFN-16 C $2.91 Yes
LTC4305CGN#PBF SSOP-16 C $4.00 $2.80 Yes
LTC4305CGN#TRPBF SSOP-16 C $2.86 Yes
LTC4305IDHD#PBF 5x4 DFN-16 I $4.86 $3.40 Yes
LTC4305IDHD#TRPBF 5x4 DFN-16 I $3.46 Yes
LTC4305IGN#PBF SSOP-16 I $4.79 $3.35 Yes
LTC4305IGN#TRPBF SSOP-16 I $3.41 Yes
Buy Now • Request Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Nested Addressing
  • 5V/3.3V Level Translator
  • Capacitance Buffer/Bus Extender

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