Hi-Speed USB Device PHY with UTMI Interface

Datasheet

Revision 1.2 (10-27-06)

6

SMSC USB3280

DATASHEET

Chapter 1 General Description

The USB3280 provides the Physical Layer (PHY) interface to a USB 2.0 Device Controller. The IC is

available in a 36-pin lead-free RoHS compliant QFN package.

1.1

Product Description

The USB3280 is an industrial temperature USB 2.0 physical layer transceiver (PHY) integrated circuit.

SMSC’s proprietary technology results in low power dissipation, which is ideal for building a bus

powered USB 2.0 peripheral. The PHY uses an 8-bit bidirectional parallel interface, which complies

with the USB Transceiver Macrocell Interface (UTMI) specification. It supports 480Mbps transfer rate,

while remaining backward compatible with USB 1.1 legacy protocol at 12Mbps.

All required termination and 5.25V short circuit protection of the DP/DM lines are internal to the chip.

The USB3280 also has an integrated 1.8V regulator so that only a 3.3V supply is required.

While transmitting data, the PHY serializes data and generates SYNC and EOP fields. It also performs

needed bit stuffing and NRZI encoding. Likewise, while receiving data, the PHY de-serializes incoming

data, stripping SYNC and EOP fields and performs bit un-stuffing and NRZI decoding.