USB3250 Standard Microsystems Corporation, USB3250 Datasheet - Page 6

• Manufacturer Part Number: USB3250
• Description: Usb2.0 PHY IC
• Manufacturer: Standard Microsystems Corporation

Chapter 1 General Description
Revision 1.5 (03-24-06)
1.1
1.2
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).
The Universal Serial Bus (USB) is the preferred interface to connect high-speed PC peripherals.
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.
Applications
Product Description
Scanners
Printers
External Storage and System Backup
Still and Video Cameras
PDAs
CD-RW
Gaming Devices
DATASHEET
6
SMSC GT3200, SMSC USB3250
USB2.0 PHY IC
Datasheet