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USB 2.0 transceiver includes UART multiplexing mode

Posted: 11 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:reduce part count? transceiver? transceivers? UART connector? USB connector?

To help mobile device manufacturers reduce cost and part count, Maxim Integrated Products has developed a USB 2.0 full-speed transceiver with a UART multiplexing mode that allows UART or USB signaling through the same connector.

The MAX3349EA is a USB 2.0 full-speed transceiver that features 15kV ESD protection on the D+ and D- pins, a built-in level shifter that allows a variable interface voltage (from 1.4V to 2.75V) to a microprocessor or ASIC, and a separate UART voltage-supply input to support legacy devices using 2.75V signaling. The MAX3349EA supports a maximum UART baud rate of 921kbaud.

The MAX3349EA provides an internal 1.5kilohm pull-up resistor on the D+ pin to allow the device to logically connect and disconnect from the USB bus while plugged in.

The MAX3349EA also has a suspend input for low-power operation and a Vbus-detect signal to indicate connection to the USB host. In USB mode, an internal linear regulator allows direct powering of the device from the USB cable.

The MAX3349EA operates over the extended temperature range (-40C to 85C). This device is available in 2-by-2mm, 16-bump (4x) UCSP and 4-by-4-by-0.8mm, 16-pin TQFN packages. Prices start at $1.20 (2,500-up, FOB USA).

- Ismini Scouras

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