What is FSA321?

This electronic component, produced by the manufacturer "Fairchild Semiconductor", performs the same function as "USB2.0 Hi-Speed (480Mbps) and Audio Switches".

FSA321 Datasheet PDF - Fairchild Semiconductor

Part Number FSA321
Description USB2.0 Hi-Speed (480Mbps) and Audio Switches
Manufacturers Fairchild Semiconductor 
Logo Fairchild Semiconductor Logo 

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September 2009
FSA321 — USB2.0 Hi-Speed (480Mbps) and Audio
Switches with Negative Signal Capability and Built-in
Termination on Unselected Audio Paths
ƒ Audio: 1.8Ω Typical On Resistance
ƒ HS-USB: 8Ω Typical On Resistance
ƒ HS-USB: 5pF Typical On Capacitance
ƒ USB Path -3db Bandwidth: > 720MHz
ƒ Negative Swing Capable Audio Channel
ƒ Power-off Protection on Common D+/R, D-/L Ports
ƒ Automatic USB Detection (Configurable)
ƒ Power-Off Protection on all I/O Ports
ƒ OVT on all I/O Ports
ƒ Flow-Through Pin Out Eliminates PCB Vias
ƒ Built-In Termination on Unselected Audio Paths to
Inhibit Audio Pop
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.
ƒ MP3, Cell Phone, PDA, Digital Camera, and
ƒ LCD Monitor, TV, and Set-Top Box
For additional performance information, please contact
Ordering Information
Part Number Package Number Top Mark
Eco Status
Package Description
10-Lead Quad, Ultrathin MLP, 1.4 x 1.8mm
For Fairchild’s definition of Eco Status, please visit:
A/LP Sel
Figure 1. FSA321 Analog Symbol
© 2007 Fairchild Semiconductor Corporation
FSA321 • Rev 1.0.4

Part Details

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