Transceiver’s reinforced isolator protects against transients

Designed with a reinforced isolator that guards against ground-to-ground voltage differentials and large common mode transients, the LTM2894 USB uModule (micromodule) has been introduced by Linear Technology.

It has a rugged interface and internal isolation making it suitable for systems implementing USB in harsh industrial or medical environments where protection from high voltages is required. The LTM2894 separates grounds by isolating a pair of USB signal transceivers using internal signal isolation, providing 7500VRMS isolation and superior common mode transient rejection of greater than 50kV/micro seconds.  Able to withstand up to 1000VRMS continuously, the LTM2894 also provides 17.4mm of creepage. This distance that allows medical equipment, per IEC 60601-1, to operate from mains voltages greater than 250VRMS and satisfy two MOPP (means of patient protection).

Designed for USB hub, host and bus isolation applications, the ±20kV ESD-protected transceivers operate at USB 2.0 full speed (12Mbit/s) and low speed (1.5Mbit/s). Other features are a suspend mode which monitors for inactivity and reduces VBUS current to less than 2.0mA. Integrated downstream facing pull-down resistors and upstream facing pull-up resistors are automatically configured to match the speed of the downstream device, allowing the device to monitor and report bus speeds to the host.

The LTM2894 is available in a compact 22 x 6.25mm surface mount BGA package. No external components are needed, says the company – all ICs and passive components are housed in this RoHS-compliant package. Commercial, industrial and automotive versions support 0 to 70, -40 to +85 and -40 to +125 degree C, respectively.

http://www.linear.com/product/LTM2894 

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