Hi-Speed USB Host or Device PHY With UTMI+ Interface
Highlights
• USB-IF “Hi-Speed” certified to the Universal Serial
Bus Specification Rev. 2.0
• Interface compliant with the UTMI+ Specification,
Rev. 1.0
• Functional as a host or device PHY
• Supports HS, FS, and LS data rates
• Supports FS pre-amble for FS hubs with a LS
device attached (UTMI+ Level 3)
• Supports HS SOF and LS keep alive pulse
• Low Latency Hi-Speed Receiver (43 Hi-Speed
clocks Max)
• Internal 1.8 volt regulators allow operation from a
single 3.3 volt supply
• Internal short circuit protection of DP and DM
lines to VBUS or ground
• Integrated 24MHz Crystal Oscillator supports
either crystal operation or 24MHz external clock
input
• Internal PLL for 480MHz Hi-Speed USB operation
• Supports Hi-Speed USB and legacy USB 1.1
devices
• 55mA Unconfigured Current (typical) - ideal for
bus powered applications
• 83uA suspend current (typical) - ideal for battery
powered applications
• Full Commercial operating temperature range
from 0
C to +70
C
• 40 pin QFN RoHS compliant package
(6 x 6 x 0.9mm height)
Functional Overview
The USB3450 is a highly integrated USB transceiver
system. It contains a complete Hi-Speed PHY with the
UTMI+ industry standard interface to support fast time
to market for a USB controller. The USB3450 is com-
posed of the functional blocks shown below.
USB3450 Block Diagram
VDDA1.8
VDD1.8
m
24 MHz
XTAL
VDD3.3
Internal
Regulator &
POR
XTAL &
PLL
VDD3.3
Rpu_dp
Rpu_dm
XO
XI
XCVRSEL[1:0]
TERMSEL
TXREADY
SUSPENDN
TXVALID
RESET
RXACTIVE
OPMODE[1:0]
CLKOUT
LINESTATE[1:0]
HOSTDISC
DATA[7:0]
HOST
RXERROR
DP
DM
Mini-AB
USB
Connector
UTMI+
Digital
HS XCVR
Resistors
Bias
Gen.
RBIAS
FS/LS
XCVR
USB3450
2005 - 2016 Microchip Technology Inc.
DS00002105A-page 1
Rpd_dm
Rpd_dp
USB3450
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Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-
rent devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the
revision of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site;
http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are
using.
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DS00002105A-page 2
2005 - 2016 Microchip Technology Inc.
USB3450
Table of Contents
1.0 General Description ........................................................................................................................................................................ 4
2.0 Pin Configuration and Pin Definitions ............................................................................................................................................. 6
Appendix A: Data Sheet Revision History ........................................................................................................................................... 35
The Microchip Web Site ...................................................................................................................................................................... 36
Customer Change Notification Service ............................................................................................................................................... 36
Customer Support ............................................................................................................................................................................... 36
Product Identification System ............................................................................................................................................................. 37
2005 - 2016 Microchip Technology Inc.
DS00002105A-page 3
USB3450
1.0
GENERAL DESCRIPTION
The USB3450 is a stand-alone Hi-Speed USB Physical Layer Transceiver (PHY). The USB3450 uses a UTMI+ interface
to connect to an SOC or ASIC or FPGA. Microchip’s advanced proprietary technology minimizes power dissipation,
resulting in maximum battery life for portable applications. The USB3450 is a flexible solution for adding USB to new
designs without integrating the analog PHY block.
FIGURE 1-1:
BASIC UTMI+ USB DEVICE BLOCK DIAGRAM
SOC/FPGA/ASIC
Including Device Controller
USB3450
V
BUS
UTMI+
Interface
Hi-Speed
USB App.
UTMI+
Link
UTMI+
Digital
Logic
Hi-
Speed
Analog
ID
DM
DP
USB
Connector
(Standard
or Mini)
The USB3450 provides a fully compliant Hi-Speed interface, and supports Hi-Speed (HS), Full-Speed (FS), and Low-
Speed (LS) USB. The USB3450 supports all levels of the UTMI+ specification as shown in
Figure 1-2.
FIGURE 1-2:
UTMI+ LEVEL 3 SUPPORT
UTMI+ Level 3
Hi-Speed Peripheral, host controllers, On-
the-Go devices
(HS, FS, LS, preamble packet)
ADDED FEATURES
UTMI+ Level 2
Hi-Speed Peripheral, host controllers, On-
the-Go devices
(HS, FS, and LS but no preamble packet)
UTMI+ Level 1
Hi-Speed Peripheral, host controllers,
and On-the-Go devices
(HS and FS Only)
UTMI+ Level 0
Hi-Speed Peripherals Only
USB3450
USB3500
USB3280
USB3250
DS00002105A-page 4
2005 - 2016 Microchip Technology Inc.
USB3450
1.1
Applications
The USB3450 is targeted for any application where a high speed USB connection is desired.
The USB3450 is well suited for:
•
•
•
•
•
•
•
•
•
Cell Phones
MP3 Players
Scanners
Set Top Boxes
Printers
External Hard Drives
Still and Video Cameras
Portable Media Players
Entertainment Devices
1.2
Reference Documents
• Universal Serial Bus Specification, Revision 2.0, April 27, 2000
• Hi-Speed Transceiver Macrocell Interface (UTMI) Specification, Version 1.02, May 27, 2000
• UTMI+ Specification, Revision 1.0, February 2, 2004
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