## Technical Overview: U74HC07L-P14-R The **U74HC07L-P14-R** is a high-speed CMOS device featuring six independent **Hex Buffers/Drivers** with **Open-Drain outputs**. It is widely used in digital circuits for voltage level shifting and driving high-current loads. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Logic Family** | 74HC (High-speed CMOS) | | **Function** | Hex Buffer / Driver | | **Output Type** | Open-Drain | | **Supply Voltage ($V_{CC}$)** | 2.0V to 6.0V | | **Package Type** | TSSOP-14 (indicated by P14) | | **Operating Temperature** | -40°C to +85°C | | **Output Voltage ($V_{OH}$)** | Max 6.0V (external pull-up required) | --- ### 2. Functional Description Unlike standard buffers that push a high voltage (logic 1) out, an **Open-Drain** output acts like a switch to ground. * **Logic 0 (Low):** The output transistor turns on, connecting the pin to Ground ($V_{SS}$). * **Logic 1 (High):** The output transistor turns off, putting the pin in a **High-Impedance (Hi-Z)** state. > **Note:** To achieve a logic "High" output voltage, an external pull-up resistor must be connected between the output pin and the desired voltage rail. --- ### 3. Pin Configuration (TSSOP-14) | Pin No. | Symbol | Description | | :---: | :--- | :--- | | 1 | 1A | Data Input 1 | | 2 | 1Y | Data Output 1 | | 3 | 2A | Data Input 2 | | 4 | 2Y | Data Output 2 | | 5 | 3A | Data Input 3 | | 6 | 3Y | Data Output 3 | | 7 | GND | Ground (0V) | | 8 | 4Y | Data Output 4 | | 9 | 4A | Data Input 4 | | 10 | 5Y | Data Output 5 | | 11 | 5A | Data Input 5 | | 12 | 6Y | Data Output 6 | | 13 | 6A | Data Input 6 | | 14 | $V_{CC}$ | Supply Voltage | --- ### 4. Typical Applications * **Level Shifting:** Converting a lower voltage logic signal (e.g., 3.3V) to a higher voltage logic (e.g., 5.0V or 6.0V) by using a pull-up resistor connected to the higher rail. * **Driving LEDs/Relays:** Since it is a driver, it can sink more current than standard logic gates. * **Wired-AND Logic:** Multiple open-drain outputs can be connected to a single pull-up resistor to create a logic gate without extra components. --- ### 5. Part Number Breakdown (UTC Naming Convention) * **U74HC:** High-speed CMOS Series. * **07:** Logic function (Hex Buffer with Open-Drain). * **L:** Lead-free / Halogen-free. * **P14:** Package code (TSSOP-14). * **R:** Tape & Reel packaging.