The **U74LVC1G126-AF5-R** is a high-performance, low-voltage CMOS device. It functions as a **single bus buffer gate with a 3-state output**. This specific part is commonly manufactured by UTC (Unisonic Technologies). --- ## 1. Technical Specifications | Parameter | Specification | |:---|:---| | **Function** | Single Buffer/Line Driver (3-State) | | **Logic Family** | LVC (Low Voltage CMOS) | | **Supply Voltage (Vcc)** | 1.65V to 5.5V | | **Output Current (Ioh/Iol)** | ±24mA (at 3.0V) | | **Propagation Delay** | ~3.7ns (at 3.3V) | | **Package Type** | SOT-25 / SOT-23-5 (AF5 suffix) | | **Operating Temperature** | -40°C to +85°C | --- ## 2. Pin Configuration (SOT-23-5) The device typically follows a standard 5-pin layout for single-gate logic: 1. **OE (Pin 1):** Output Enable (Active HIGH). When LOW, the output is in a high-impedance (Hi-Z) state. 2. **A (Pin 2):** Data Input. 3. **GND (Pin 3):** Ground. 4. **Y (Pin 4):** Data Output. 5. **Vcc (Pin 5):** Power Supply. --- ## 3. Logic Functionality The "126" logic identifies this as a non-inverting buffer where the output is controlled by an **Active High** Output Enable (OE). ### Truth Table | Input OE | Input A | Output Y | |:---:|:---:|:---:| | H | H | H | | H | L | L | | L | X | Z (High Impedance) | * **H** = High Level * **L** = Low Level * **X** = Irrelevant * **Z** = High Impedance (disconnected state) --- ## 4. Key Features & Applications ### Key Features * **I-off Circuitry:** Supports partial power-down mode operation. It prevents damaging backflow current when the device is powered down. * **Wide Voltage Range:** Compatible with 1.8V, 2.5V, 3.3V, and 5V logic systems. * **High Drive Capability:** Can drive long PCB traces or multiple loads due to the 24mA output current. ### Common Applications * **Bus Isolation:** Separating different sections of a data bus to prevent loading. * **Signal Buffering:** Strengthening a weak signal to drive more components. * **Voltage Translation:** Can be used to interface between different logic levels (e.g., 3.3V to 5V) depending on Vcc. ---