USB333X datasheet(4/85 Pages) MICROCHIP

4 / 85 page

USB333x

DS00001880A-page 4

 2009 - 2015 Microchip Technology Inc.

1.0

INTRODUCTION

1.1

General Description

Microchip’s USB333x is a family of High Speed USB 2.0 Transceivers that provides a physical layer (PHY) solution well-

suited for portable electronic devices. Both commercial and industrial temperature applications are supported.

Each model in the USB333x family may use a 60MHz reference clock or the model-number specific reference clock as

shown on the Product Identification System page. The USB3330 and USB3333 can support several different frequen-

cies driven on the REFCLK pin. The configuration of the frequency selection pins set the desired reference frequency.

Several advanced features make the USB333x the transceiver of choice by reducing both eBOM part count and printed

circuit board (PCB) area. Outstanding ESD robustness eliminates the need for external ESD protection devices in typ-

ical applications. The internal Over-Voltage Protection circuit (OVP) protects the USB333x from voltages up to 30V on

the VBUS pin. By using a reference clock from the Link, the USB333x removes the cost of a dedicated crystal reference

from the design. The USB333x includes integrated 3.3V and 1.8V regulators, making it possible to operate the device

from a single power supply.

The USB333x is optimized for use in portable applications where a low operating current and standby current is essen-

tial. The USB333x also supports the Link Power Management protocol (LPM) to further reduce USB operating currents.

The USB333x also includes integrated battery charger detection circuitry. These circuits are used to detect the attach-

ment of a USB Charger as described in Section 5.8. By sensing the attachment to a USB Charger, a product using the

USB333x can draw more than 500mA from the USB connector.

The USB333x meets all of the electrical requirements for a High Speed USB Host, Device, or an On-the-Go (OTG) trans-

ceiver. In addition to the supporting USB signaling, the USB333x also provides USB UART mode and, in versions with

the integrated USB switch, USB Audio mode.

USB333x uses the industry standard UTMI+ Low Pin Interface (ULPI) to connect the USB PHY to the Link. ULPI uses

a method of in-band signaling and status byte transfers between the Link and PHY to facilitate a USB session with only

twelve pins.

The USB333x uses Microchip’s “wrapper-less” technology to implement the ULPI interface. This “wrapper-less” tech-

nology allows the PHY to achieve a low latency transmit and receive time. Microchip’s low latency transceiver allows an

existing UTMI Link to be reused by adding a UTMI to ULPI bridge. By adding a bridge to the ASIC the existing and

proven UTMI Link IP can be reused.

Versions of the USB333x with the integrated USB switch enable a single USB port of connection.

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