FN6820 Rev 0.00

Page 1 of 13

December 16, 2008

FN6820

Rev 0.00

December 16, 2008

ISL54221

High-Speed USB 2.0 (480Mbps) Multiplexer

DATASHEET

The Intersil ISL54221 is a single supply dual 2:1 multiplexer

that can operate from a single 2.7V to 5.5V supply. It contains

two SPDT (Single Pole/Double Throw) switches configured as

a DPDT. The part was designed for switching or routing of

USB High-Speed signals and/or USB Full-speed signals in

portable battery powered products.

The 6.7

designed to pass USB full-speed data signals that range from

0V to 3.3V and USB high-speed data signals that range from

0V to 400mV. They have high bandwidth and low capacitance

to pass USB high-speed data signals with minimal distortion.

The part can be used in Personal Media Players and other

portable battery powered devices that need to route USB

high-speed signals or full-speed signals to different

transceiver sections of the device while connected to a single

USB host (computer).

The digital logic inputs are 1.8V logic compatible when

operated with a 2.7V to 3.6V supply. The ISL54221 has an

output enable pin to open all the switches. It can be used to

facilitate proper bus disconnect and connection when

switching between the USB sources.

The ISL54221 is available in a tiny 10 Ld 2.1mmx1.6mm

µTQFN package. It operates over a temperature range of

-40 to +85°C.

Features

• High-Speed (480Mbps) and Full-Speed (12Mbps)

Signaling Capability per USB 2.0

• 1.8V Logic Compatible (2.7V to +3.6V supply)

• Enable Pin to Open all Switches

• Power OFF Protection

• D-/D+ Pins Overvoltage Tolerant to 5.5V

• -3dB Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . 742MHz

• Low ON Capacitance . . . . . . . . . . . . . . . . . . . . . . . . 7.4pF

• Available in µTQFN Package

• Pb-Free (RoHS Compliant)

• Compliant with USB 2.0 Short Circuit and Overvoltage

Requirements Without Additional External Components

Applications

• MP3 and other Personal Media Players

• Cellular/Mobile Phones

•PDA’s

• Digital Cameras and Camcorders

• USB Switching

Application Block Diagram

PORTABLE MEDIA DEVICE

ISL54221

USB

TRANSCEIVER

HIGH-SPEED

D-

D+

SEL

GND

HSD1-

HSD1+

HSD2-

HSD2+

OE

LOGIC CIRCUITRY

µCONTROLLER

USB

TRANSCEIVER

FULL-SPEED

VBUS

D-

D+

GND

OR

FULL-SPEED

HIGH_SPEED

OR