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LTC4309IDE#PBF

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

Manufacturer:

Analog Devices, Inc
Mfr.Part #:

LTC4309IDE#PBF
Datasheet:

LTC4309IDE#PBF Datasheet (PDF)
feature-minimum-operating-supply-voltage-v:

2.3
feature-maximum-operating-supply-voltage-v:

5.5
feature-packaging:

Tube
feature-pin-count:

12
EDA/CAD Models:

Request Free CAD Models for LTC4309IDE#PBF

Email: [email protected]

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Tel: +852 95804164

LTC4309IDE#PBF General Description

The LTC4309 hot swappable 2-wire bus buffer allows I/O card insertion into a live backplane without corruption of the data and clock busses. The LTC4309 provides bidirectional buffering, keeping the backplane and card capacitances isolated. Low offset and high V_OL tolerance allows cascading of multiple devices on the clock and data busses. If SDAOUT or SCLOUT are low for 30ms, FAULT will pull low indicating a stuck bus low condition. If DISCEN is tied high, the LTC4309 will automatically break the bus connection and generate up to 16 clock pulses and a stop bit in an attempt to free the bus. A connection will resume if the stuck bus is cleared. If DISCEN is connected to GND, the busses will remain connected with no clock or stop bit generation. ACC input enables rise-time accelerators for high capacitively loaded busses.

Key Features

Bidirectional Buffer Increases Fan-out
60mV Buffer Offset Independent of Load
Optional Disconnect when Bus is Stuck Low
Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane
Level Shift 2.5V, 3.3V and 5V Busses
Compatible with Non-Compliant V_OL I²C Devices
±6kV Human Body Model ESD Ruggedness
Isolates Input SDA and SCL Lines from Output
Compatible with I²C^™, I²C Fast-Mode and SMBus
READY Open Drain Output
FAULT Open Drain Output
1V Precharge on All SDA and SCL Lines
Optional Rise Time Accelerators
High Impedance SDA, SCL Pins for V_CC = 0
Available in Small 12-Pin DFN (4mm × 3mm) and 16-Lead SSOP Packages

Application

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

Specifications

feature-minimum-operating-supply-voltage-v	2.3	feature-process-technology
feature-maximum-operating-supply-voltage-v	5.5	feature-packaging	Tube
feature-rad-hard		feature-pin-count	12
feature-cecc-qualified	No	feature-esd-protection	Yes
feature-escc-qualified		feature-military	No
feature-aec-qualified	Yes	feature-aec-qualified-number
feature-auto-motive	No	feature-p-pap	No
feature-eccn-code	EAR99	feature-svhc	No
feature-svhc-exceeds-threshold	No