Product category: Analogue and Mixed Signal ICs
News Release from: Linear Technology Corp | Subject: LTC4305 and LTC4306
Edited by the Electronicstalk Editorial Team on 07 December 2005
Bus multiplexers provide capacitive
isolation
New two-wire bus multiplexers provide capacitive isolation when connecting an upstream I2C bus to a desired combination of downstream buses.
New from Linear Technology, the LTC4305 and LTC4306 are two-wire bus multiplexers that provide capacitive isolation when connecting an upstream I2C bus to a desired combination of downstream buses The software-controlled LTC4305 multiplexes two channels, whereas the LTC4306 splits the I2C bus into four subbranches
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The I2C multiplexing allows for reliable switching of multiple system management buses and multiple I2C devices.
Multiplexing allows address expansion as well as addressing one of multiple identical devices, thus resolving address conflict issues.
These devices have applications in all levels of computers, including workstations, servers and desktop PCs.
Many I2C and SMBus devices operate at different voltage levels, yet they are constrained to share a common bus.
The LTC4305 and LTC4306 are supply independent; therefore, each channel can be pulled to a supply voltage ranging from 2.2 to 5.5V, regardless of the ICs' supply voltage.
This level translation is performed without the need of a second supply pin or a second pair of input pull-up resistors.
The downstream channels are provided with two (LTC4305) and four (LTC4306) "alert" inputs for fault reporting.
If a stuck bus is detected, a selectable programmable timeout circuitry will automatically break the data and clock bus connections are enabled.
The SDA and SCL pins of both ICs feature +/-10kV ESD protection for ruggedness.
When activated, the rise time accelerator circuitry sources currents into the two-wire bus pin to reduce rise times.
Each IC allows for 27 distinct bus addresses that are configurable by using the three tristate address pins.
The LTC4306 also features two general purpose input/output (GPIO) pins that can be configured as inputs, open-drain outputs, or push-pull outputs.
The LTC4305 is available in 16-lead SSOP and 4 x 5mm DFN packages.
The LTC4306 is available in 24-lead SSOP and 4 x 5mm QFN packages.
Offered over the commercial and industrial temperature ranges, pricing for the LTC4305/LTC4306 begins at $2.80 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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