LTC4308

PRODUCTION

Low Voltage, Level Shifting Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery

Part Models: 8
1ku List Price: Starting From $2.60

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Overview

Optimized for Low Voltage Systems Down to 0.9V
Bidirectional Buffer with Stuck Bus Recovery
-200mV Offset In-Out/+300mV Offset Out-In
30ms Stuck Bus Timeout
Compatible with Non-Compliant V_OL I²C Devices
Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane
±6kV Human Body Model (HBM) ESD Protection
Isolates Input SDA and SCL Lines from Output
Compatible with I²C^™, I²C Fast Mode and SMBus
READY Open-Drain Output
1V Precharge on SDAOUT and SCLOUT Lines
Small 8-Lead (3mm × 3mm × 0.75mm) DFN and 8-Lead MSOP Packages

The LTC4308 hot swappable, 2-wire bus buffer allows I/O card insertion into a live backplane without corruption of the data and clock busses. The LTC4308 provides bidirectional buffering, keeping the backplane and card capacitances isolated. Negative offset from output to input allows communication between output bus devices with high V_OL and devices on the low voltage input side, where bus supplies can be as low as 0.9V. If SDAOUT or SCLOUT are low for 30ms, the LTC4308 will automatically break the Input-Output connection. At this time the LTC4308 automatically generates up to 16 clock pulses on SCLOUT in an attempt to free the bus. A connection will resume if the stuck bus is cleared.

During insertion, the SDAOUT and SCLOUT lines are pre-charged to 1V to minimize bus disturbances. When driven high, the ENABLE input allows the LTC4308 to connect after a stop bit or bus idle condition. Driving ENABLE low breaks the connection between SDAIN and SDAOUT, SCLIN and SCLOUT. READY is an open-drain output which indicates that the backplane and card sides are connected.

Applications

Live Board Insertion
Servers
Capacitance Buffer/Bus Extender
RAID Systems
ATCA

Part Models: 8
1ku List Price: Starting From $2.60

Documentation

Data Sheet 1

LTC4308: Low Voltage, Level Shifting Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery Data Sheet 04/11/2008

Reliability Data 1

R527 Reliability Data 03/26/2018

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4308CDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4308CDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4308CMS8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4308CMS8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4308IDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4308IDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4308IMS8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4308IMS8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 30, 2020 - 20_0244 Notification of Wafer Fab Location Change for 0.6µm CMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0244_Form Material_Report Delta Qualification Matrix Qualification Results Summary Other
LTC4308CDD#PBF	PRODUCTION
LTC4308CDD#TRPBF	PRODUCTION
LTC4308CMS8#PBF	PRODUCTION
LTC4308CMS8#TRPBF	PRODUCTION
LTC4308IDD#PBF	PRODUCTION
LTC4308IDD#TRPBF	PRODUCTION
LTC4308IMS8#PBF	PRODUCTION
LTC4308IMS8#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC4308CMS8#PBF	PRODUCTION
LTC4308CMS8#TRPBF	PRODUCTION
LTC4308IMS8#PBF	PRODUCTION
LTC4308IMS8#TRPBF	PRODUCTION
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0128_Form Material_Report
LTC4308CMS8#PBF	PRODUCTION
LTC4308CMS8#TRPBF	PRODUCTION
LTC4308IMS8#PBF	PRODUCTION
LTC4308IMS8#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Interface Transceivers & Isolators 1
LTM2883	PRODUCTION	SPI/Digital or I²C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power

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