USB3250 datasheet(6/48 Pages) SMSC

6 / 48 page

USB2.0 PHY IC

Datasheet

Revision 1.5 (03-24-06)

SMSC GT3200, SMSC USB3250

DATASHEET

Chapter 1 General Description

The GT3200 and USB3250 provide the Physical Layer (PHY) interface to a USB2.0 Device Controller.

The IC is available in a 64 pin lead TQFP (GT3200) or a 56 pin QFN (USB3250).

1.1

Applications

The Universal Serial Bus (USB) is the preferred interface to connect high-speed PC peripherals.

Scanners

Printers

External Storage and System Backup

Still and Video Cameras

PDAs

CD-RW

Gaming Devices

1.2

Product Description

The GT3200 and USB3250 are USB2.0 physical layer transceiver (PHY) integrated circuits. SMSC's

proprietary technology results in low power dissipation, which is ideal for building a bus powered

USB2.0 peripheral. The PHY can be configured for either an 8-bit unidirectional or a 16-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 for the USB2.0 Transceiver is internal. Internal 5.25V short circuit protection of

DP and DM lines is provided for USB compliance.

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.

USB3250 数据表(PDF) 6 Page - SMSC Corporation