FSA321_12 Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – USB2.0 Hi-Speed (480Mbps) and Audio Switches with Negative Signal Capability and Built-in Termination on Unselected Audio Paths

March 2012
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 V_BUS detection. The FSA321 includes a
power-off feature as well as over-voltage tolerance to
minimize current consumption when V_SW exceeds V_CC.
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
FSA321UMX
Package
Number
MLP010A
Top Mark
Package Description
GL
10-Lead Quad, Ultrathin Molded Leadless Package (MLP), 1.4 x 1.8mm
© 2007 Fairchild Semiconductor Corporation
FSA321 • Rev 1.0.6
VCC
A/LP Sel
Rpd
Control
Block
USB Sel
Rpd
D+
R
R_T
D-
L
R_T
D+/R
D-/L
Figure 1. Analog Symbol
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