LTC4315 - 2-Wire Bus Buffer with High Noise Margin

Features

  • Bidirectional Buffer Increases Fanout
  • High Noise Margin with VIL = 0.3 • VCC
  • Compatible with Non-Compliant I2C Devices That Drive a High VOL
  • Selectable Rise Time Accelerator Current
  • Level Shift 1.5V, 1.8V, 2.5V, 3.3V and 5V Busses
  • Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane
  • Stuck Bus Disconnect and Recovery
  • Compatible with I2C, I2C Fast Mode and SMBus
  • ±4kV Human Body Model ESD Ruggedness
  • High Impedance SDA, SCL pins When Unpowered
  • 12-Lead (4mm × 3mm) DFN and 12-Lead MSOP Packages
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC4315 Typical Application
LTC4315 Typical Application

Description

The LTC4315 is a hot-swappable 2-wire bus buffer that provides bidirectional buffering, while maintaining a low offset voltage and high noise margin up to 0.3 • VCC. The high noise margin allows the LTC4315 to be interoperable with devices that drive a high VOL (>0.4V) and allows multiple LTC4315s to be cascaded. The LTC4315 supports level translation between 1.5V, 1.8V, 2.5V, 3.3V and 5V busses.

During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances. Connection is established between the input and output after ENABLE is asserted high and a stop bit or bus idle condition has been detected on the SDA and SCL pins.

If both data and clock are not simultaneously high at least once in 45ms and DISCEN is high, a FAULT signal is generated indicating a stuck bus low condition and the input is disconnected from the output. Up to 16 clock pulses are subsequently generated to free the stuck bus. A three state ACC pin enables input and output side rise time accelerators of various strengths.

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
LTC4315CDE#PBF 4x3 DFN-12 DE/UE C 05-08-1695 Yes
LTC4315CDE#TRPBF 4x3 DFN-12 DE/UE C 05-08-1695 Yes
LTC4315CMS#PBF MS-12 MS C 05-08-1668 Yes
LTC4315CMS#TRPBF MS-12 MS C 05-08-1668 Yes
LTC4315IDE#PBF 4x3 DFN-12 DE/UE I 05-08-1695 Yes
LTC4315IDE#TRPBF 4x3 DFN-12 DE/UE I 05-08-1695 Yes
LTC4315IMS#PBF MS-12 MS I 05-08-1668 Yes
LTC4315IMS#TRPBF MS-12 MS I 05-08-1668 Yes


LTC4315 Package Drawing
LTC4315 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
LTC4315CDE#PBF 4x3 DFN-12 C $3.57 $2.50 Yes
LTC4315CDE#TRPBF 4x3 DFN-12 C $2.56 Yes
LTC4315CMS#PBF MS-12 C $3.57 $2.50 Yes
LTC4315CMS#TRPBF MS-12 C $2.56 Yes
LTC4315IDE#PBF 4x3 DFN-12 I $4.11 $2.88 Yes
LTC4315IDE#TRPBF 4x3 DFN-12 I $2.94 Yes
LTC4315IMS#PBF MS-12 I $4.11 $2.88 Yes
LTC4315IMS#TRPBF MS-12 I $2.94 Yes
Buy NowRequest 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

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC4315IMS#PBF MS-12 I $4.11 $2.88 Yes
LTC4315IMS#TRPBF MS-12 I $2.94 Yes
Buy NowRequest 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.

Applications

  • Capacitance Buffers/Bus Extender
  • Live Board Insertion
  • Telecommunications Systems Including ATCA
  • Level Translation
  • PMBus
  • Servers

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