The **U74LVC32AL-S14-R** is a specific integrated circuit (IC) manufactured by Unisonic Technologies (UTC). It belongs to the **LVC (Low-Voltage CMOS)** family and functions as a quadruple 2-input OR gate. ### 1. General Specifications This IC contains four independent OR gates, each performing the Boolean function $Y = A + B$. | Feature | Specification | | :--- | :--- | | **Logic Type** | OR Gate | | **Number of Circuits** | 4 | | **Inputs per Gate** | 2 | | **Operating Voltage Range** | 1.2V to 3.6V | | **Output Drive Capability** | $\pm$ 24mA (at 3.0V) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Part Number Breakdown Understanding the suffix helps identify the physical characteristics of the component: * **U74LVC32A**: The base functional part (Quad 2-Input OR Gate, LVC series). * **L**: Lead-free/Halogen-free (Environmentally friendly). * **S14**: Package type, typically **SOP-14** (Small Outline Package with 14 pins). * **R**: Packing style, indicating **Tape & Reel** (for automated pick-and-place assembly). --- ### 3. Key Technical Features * **Low Power Consumption:** Ideal for battery-powered devices. * **5V Tolerant Inputs:** The inputs can handle up to 5.5V even when the supply voltage ($V_{CC}$) is lower (e.g., 3.3V). This makes it excellent for **level shifting**. * **High Speed:** Typical propagation delay is approximately 3.8ns at 3.3V. * **Ioff Protection:** Supports partial power-down mode operation. When $V_{CC} = 0V$, the inputs and outputs are high-impedance, preventing damaging backflow current. --- ### 4. Pin Configuration (SOP-14) The standard layout for a 74xx32 series in a 14-pin package is: | Pin Number | Symbol | Description | | :--- | :--- | :--- | | 1, 2 | 1A, 1B | Inputs for Gate 1 | | 3 | 1Y | Output for Gate 1 | | 4, 5 | 2A, 2B | Inputs for Gate 2 | | 6 | 2Y | Output for Gate 2 | | 7 | GND | Ground (0V) | | 8, 9 | 3Y | Output for Gate 3 | | 10, 11 | 3B, 3A | Inputs for Gate 3 | | 12, 13 | 4Y | Output for Gate 4 | | 14 | $V_{CC}$ | Power Supply | --- ### 5. Truth Table (Per Gate) | Input A | Input B | Output Y | | :---: | :---: | :---: | | L | L | **L** | | L | H | **H** | | H | L | **H** | | H | H | **H** |