Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
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reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
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version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
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Revision 1.3 (11-20-12)
2
SMSC USB333x
PRODUCT PREVIEW
Industry’s Smallest Hi-Speed USB Transceiver with Single Supply Operation
General Description
SMSC’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 shown in Order Numbers on page 2. The USB3330 and USB3333 can support several
different frequencies 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 typical 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.
Versions of the USB333x with the integrated USB switch enable unique product features with a single
USB port of connection.
The USB333x is optimized for use in portable applications where a low operating current and standby
current is essential. 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 attachment of a USB Charger. 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) transceiver. 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 SMSC’s “wrapper-less” technology to implement the ULPI interface. This “wrapper-
less” technology allows the PHY to achieve a low latency transmit and receive time. SMSC’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.
SMSC USB333x
PRODUCT PREVIEW
3
Revision 1.3 (11-20-12)
Industry’s Smallest Hi-Speed USB Transceiver with Single Supply Operation
REFCLK
VBUS
ID
OVP
ESD Protection
OTG
Low Jitter
Integrated
PLL
BIAS
RBIAS
DP
DM
Hi-Speed
USB
Transceiver
USB
DP/DM
Switch
ULPI
Registers
and State
Machine
Integrated
Power
Management
RESETB
VBAT
VDD33
VDD18
ULPI
Interface
STP
NXT
DIR
CLKOUT
SPK_L
SPK_R
DATA[7:0]
Figure 1 Block Diagram (USB3331, USB3336 and USB3338)
REFCLK
VBUS
ID
OVP
ESD Protection
OTG
Low Jitter
Integrated
PLL
REF[1:0]
BIAS
RBIAS
DP
DM
Hi-Speed
USB
Transceiver
ULPI
Registers
and State
Machine
Integrated
Power
Management
RESETB
VBAT
VDD33
VDD18
ULPI
Interface
STP
NXT
DIR
CLKOUT
DATA[7:0]
Figure 2 Block Diagram (USB3330)
Revision 1.3 (11-20-12)
PRODUCT PREVIEW
4
SMSC USB333x
Industry’s Smallest Hi-Speed USB Transceiver with Single Supply Operation
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