USB334X datasheet(4/92 Pages) MICROCHIP

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USB334x

DS00002646A-page 4

 2009-2018 Microchip Technology Inc.

1.0

GENERAL DESCRIPTION

Microchip’s USB334x is a family of Hi-Speed USB 2.0 Transceivers that provide a physical layer (PHY) solution well-

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

Each model in the USB334x family may use a 60MHz reference clock or the model-number specific reference clock

shown on the Product Identification System page.

Several advanced features make the USB334x 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 USB334x from voltages up to 30V on

the VBUS pin. By using a reference clock from the Link, the USB334x removes the cost of a dedicated crystal reference

from the design. The USB334x includes integrated 3.3V and 1.8V regulators, making it possible to operate the device

from a single power supply.

The USB334x is optimized for use in portable applications where a low operating current and standby currents are

essential. The USB334x operates from a single supply and includes integrated regulators for its supplies. The USB334x

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

The USB334x family is enabled with RapidCharge Anywhere which supports USB-IF Battery Charging 1.2 for any por-

table device. RapidCharge Anywhere provides three times the charging current through a USB port over traditional solu-

tions which translate up to 1.5Amps via compatible USB host or dedicated charger. In addition, this provides a complete

USB charging ecosystem between device and host ports such as Dedicated Charging Port (DCP), Charging (CDP) and

Standard (SDP) Downstream Ports. Section 5.9, "USB Charger Detection Support," on page 38 describes this is further

detail.

The USB334x meets all of the electrical requirements for a Hi-Speed USB Host, Device, or an On-the-Go (OTG) trans-

ceiver. In addition to the supporting USB signaling, the USB334x also provides USB UART mode and, in versions with

the integrated USB switch, USB Audio mode.

USB334x uses the industry standard UTMI+ Low Pin Interface (ULPI) to connect the USB transceiver 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 USB334x uses “wrapper-less” technology to implement the ULPI interface. This “wrapper-less” technology 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 USB334x with the integrated USB switch enable a single USB port of connection.

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