FSA321 datasheet(2/14 Pages) ONSEMI

2 / 14 page

March 2013

www.fairchildsemi.com

FSA321

• Rev 1.0.6

FSA321

— USB2.0 Hi-Speed (480Mbps) and

Audio Switches with Negative Signal Capability and

Built-in Termination on Unselected Audio Paths

Features

 Audio: 1.8 Typical On Resistance

 HS-USB: 8 Typical On Resistance

 HS-USB: 5pF Typical On Capacitance

 USB Path -3db Bandwidth: > 720MHz

 Negative Swing Capable Audio Channel

 Power-off Protection on Common D+/R, D-/L Ports

 Automatic USB Detection (Configurable)

 OVT on all I/O Ports

 Flow-Through Pin Out Eliminates PCB Vias

 Built-In Termination on Unselected Audio Paths

to Inhibit Audio Pop

Applications

 MP3, Cell Phone, PDA, Digital Camera, and

Notebook

 LCD Monitor, TV, and Set-Top Box

Description

The FSA321 is a Double-Pole, Double Throw (DPDT)

multiplexer that combines a low-distortion audio and a

USB2.0 High-Speed (HS) switch path. This configuration

enables audio and USB data to share a common

connector port. The architecture is designed to allow

audio signals to swing below ground. This means a

common USB and headphone jack can be used for

personal media players and portable peripheral devices.

Since USB2.0 is an industry standard for shared data-

path in portable devices, FSA321 can be configured for

automatic VBUS detection. The FSA321 includes a

power-off feature as well as over-voltage tolerance to

minimize current consumption when VSW exceeds VCC.

Typical applications involve switching in portables and

consumer applications, such as cell phones, digital

cameras, and notebooks with hubs or controllers.

Ordering Information

Part Number

Package

Number

Top Mark

Package Description

FSA321UMX

MLP010A

10-Lead Quad, Ultrathin Molded Leadless Package (MLP), 1.4 x 1.8mm

Figure 1. Analog Symbol

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