## Overview of the FSAV331MTCX The **FSAV331MTCX** is a high-performance, low-power **Dual 4-Channel High-Speed Video Switch**. It is designed specifically for switching between high-bandwidth video sources, such as VGA or RGB signals, in applications like televisions, monitors, and laptop docking stations. --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | onsemi (formerly Fairchild Semiconductor) | | **Logic Type** | Video Switch / Multiplexer | | **Configuration** | Quad 2:1 (Dual 4-Channel) | | **Supply Voltage ($V_{CC}$)** | 4.0V to 5.5V | | **Bandwidth (-3dB)** | 300 MHz | | **On Resistance ($R_{ON}$)** | 3 $\Omega$ (Typical) | | **Package** | TSSOP-16 | | **Operating Temperature** | -40°C to +85°C | --- ### Core Functional Features 1. **Wide Bandwidth:** With a 300 MHz bandwidth, it can handle high-resolution video signals without significant signal degradation or ghosting. 2. **Low On Resistance ($R_{ON}$):** The low resistance minimizes signal attenuation and maintains signal integrity across the switch. 3. **Low Crosstalk and Isolation:** Engineered to prevent signal "bleeding" between channels, which is critical for clear video output. 4. **Rail-to-Rail Operation:** Allows the input signal to swing from the ground to the supply voltage, providing maximum dynamic range. 5. **Fast Switching Speed:** Ensures rapid transitions between input sources, reducing visual lag during switching. --- ### Pin Configuration and Typical Application The FSAV331MTCX is housed in a 16-pin **TSSOP** (Thin Shrink Small Outline Package), which is ideal for space-constrained PCB designs. #### Typical Pin Functions * **$S_0, S_1$:** Select pins used to determine which input channel is connected to the output. * **$\overline{OE}$:** Output Enable pin (Active Low). When high, the switch enters a high-impedance state. * **$I/O$ Pins:** The actual signal paths for the video data (RGB/YPbPr). #### Common Use Cases * **Desktop/Laptop PCs:** Switching between internal graphics and external docking stations. * **LCD Monitors & TVs:** Multiplexing multiple VGA or Component video inputs. * **Set-top Boxes:** Routing high-speed analog signals. --- ### Example Control Logic Table | $\overline{OE}$ | $S$ | Function | | :---: | :---: | :--- | | L | L | Channel A connected to Output | | L | H | Channel B connected to Output | | H | X | Disconnected (High Impedance) |