## Technical Analysis of U74LVC258G-S16-R The **U74LVC258G-S16-R** is a high-performance, low-voltage CMOS device. Functionally, it is a **Quad 2-Line to 1-Line Data Selector/Multiplexer** with 3-state outputs. It is designed for operation between 1.65V and 3.6V. --- ### 1. Key Functional Overview This IC contains four identical 2-input multiplexers with common Select ($S$) and Output Enable ($\bar{OE}$) inputs. The "258" logic family is unique because it provides **inverted outputs**. * **Multiplexing:** Chooses between two data sources ($A$ or $B$) for each of the four channels. * **3-State Output:** When $\bar{OE}$ is HIGH, all outputs enter a high-impedance (Hi-Z) state, allowing the device to be used in bus-oriented systems. * **Inversion:** The output is the complement of the selected input. --- ### 2. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Logic Family** | LVC (Low Voltage CMOS) | | **Supply Voltage ($V_{CC}$)** | 1.65V to 3.6V | | **Input Type** | 5V Tolerant Inputs (supports mixed-mode signal operation) | | **Output Current ($I_{OH}/I_{OL}$)** | ±24 mA (at 3.0V) | | **Propagation Delay ($t_{pd}$)** | ~3.5 ns (typical at 3.3V) | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | SOP-16 (S16) | --- ### 3. Truth Table (Per Multiplexer) The following table describes the logic behavior of the device: | Inputs ($\bar{OE}$) | Input Select ($S$) | Data A | Data B | Output ($\bar{Y}$) | | :---: | :---: | :---: | :---: | :---: | | H | X | X | X | **Z** (High Impedance) | | L | L | L | X | **H** (Inverted A) | | L | L | H | X | **L** (Inverted A) | | L | H | X | L | **H** (Inverted B) | | L | H | X | H | **L** (Inverted B) | --- ### 4. Pin Configuration Summary The SOP-16 package typically follows this layout: 1. **Select ($S$):** Common control for all four MUX channels. 2. **1A, 1B to 4A, 4B:** Data inputs for the four channels. 3. **$\bar{1Y}$ to $\bar{4Y}$:** Inverted outputs. 4. **$\bar{OE}$:** Output Enable (Active Low). 5. **$V_{CC}$ / $GND$:** Power supply pins. --- ### 5. Part Number Breakdown * **U74:** UTC (Unisonic Technologies) Manufacturer Code. * **LVC:** Low Voltage CMOS logic series. * **258:** Device function (Quad 2-to-1 MUX, Inverting). * **G:** Halogen-free/RoHS compliant. * **S16:** SOP-16 Package. * **R:** Tape & Reel packaging. ---