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Linear Tech's latest multiplexers

Posted: 13 Sep 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? ltc4305? ltc4306? bus multiplexer? multiplexer?

Linear Technology Corp. released two new 2-wire bus multiplexers that provide capacitive isolation when connecting an upstream I?C bus to a desired combination of downstream busses.

The software-controlled LTC4305 multiplexes two channels, while the LTC4306 splits the I?C bus into four sub-branches. Linear Tech explained that the I?C multiplexing allows for reliable switching of multiple system management buses and multiple I?C devices.

Since the LTC4305 and LTC4306 are supply independent, each channel can be pulled to a supply voltage ranging from 2.2V 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 2-wire bus pin to reduce rise times. Each IC allows for 27 distinct bus addresses that are configurable by using the three tri-state 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.

Rated for operation over both the commercial and industrial temperature ranges, the LTC4305 is available in 16-lead SSOP and 4-by-5mm DFN packages, and the LTC4306 is housed in 24-lead SSOP and 4-by-5mm QFN packages. Pricing for both products begins at $2.80 each for 1,000-piece quantities.

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