The **HD74ALVC2G53** is a high-speed, low-voltage CMOS device featuring a dual 2-channel analog multiplexer/demultiplexer. It is designed for applications requiring high-speed switching with minimal power consumption. --- ### ## Technical Overview The device functions as a digitally controlled analog switch. It utilizes a common terminal ($Y$) and two independent terminals ($X_0$ and $X_1$). Depending on the control input, the $Y$ terminal is connected to either $X_0$ or $X_1$. ### ### Key Specifications | Parameter | Description | | :--- | :--- | | **Logic Family** | ALVC (Advanced Low Voltage CMOS) | | **Supply Voltage ($V_{CC}$)** | 1.65V to 3.6V | | **Max Propagation Delay** | ~3.0 ns (at 3.3V) | | **On-Resistance ($R_{on}$)** | Typical 12$\Omega$ at $V_{CC}$ = 3.0V | | **Configuration** | 2-Channel Analog Mux/Demux | | **Operating Temperature** | -40°C to +85°C | --- ### ## Pin Configuration & Functionality The device typically comes in a small 8-pin package (such as SSOP or VSSOP). 1. **$S$ (Select Input):** Determines which path is active. 2. **$\bar{E}$ (Enable Input):** When Low, the switch is active. When High, the switch is in a high-impedance state (OFF). 3. **$Y$ (Common):** The shared terminal. 4. **$X_0, X_1$:** The selectable independent terminals. #### **Truth Table** | Enable ($\bar{E}$) | Select ($S$) | ON Channel | | :---: | :---: | :--- | | L | L | $Y$ to $X_0$ | | L | H | $Y$ to $X_1$ | | H | X | Disconnected (Z) | --- ### ## Notable Features * **Ultra-Low Power:** Ideal for battery-operated handheld devices. * **High Speed:** Optimized for rapid signal switching in telecommunications. * **Over-voltage Tolerance:** Control inputs are often 5V tolerant even when $V_{CC}$ is lower, allowing for level translation tasks. * **Bi-directional:** Signals can flow from $Y$ to $X_n$ or from $X_n$ to $Y$. ### ## Common Applications * **Cellular Handsets:** Routing audio or data signals between different modules. * **Signal Gating:** Turning signal paths on or off to save power. * **Multiplexing:** Sharing a single Analog-to-Digital Converter (ADC) pin between two sensors. * **Portable Instrumentation:** Switching between different gain stages or sensors.