FSA321 FAIRCHILD | Alldatasheet
Document overview
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Technical content
Features
Audio: 1.8Ω Typical On Resistance HS-USB: 8Ω 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) Power-Off Protection on all I/O Ports 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 V BUS 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. IMPORTANT NOTE: For additional performance information, please contact analogswitch@fairchildsemi.com.
Ordering Information
Part Number Package Number Top Mark Eco Status Package Description FSA321UMX MLP010A GL Green 10-Lead Quad, Ultrathin MLP, 1.4 x 1.8mm For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. VCC USB Sel R L D+/R D-/L A/LP Sel Control Block Rpd RT RT Rpd Figure 1. FSA321 Analog Symbol
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FSA321 • Rev.1.0.4 12 FSA321 — USB2.0 Hi-Speed and Audio Switches with Negative Signal Capability