## MC74ACT14NG: Technical Overview The **MC74ACT14NG** is a high-performance CMOS logic integrated circuit. Specifically, it is a **Hex Inverter with Schmitt Trigger inputs**. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and operating characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Logic Type** | Hex Inverter (6 independent channels) | | **Input Type** | Schmitt Trigger | | **Technology** | ACT (Advanced CMOS with TTL-compatible inputs) | | **Supply Voltage ($V_{CC}$)** | 4.5V to 5.5V | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | PDIP-14 (Plastic Dual In-line Package) | | **Output Current** | 24mA (High/Low) | | **Propagation Delay** | ~5.0ns to 10ns (typical) | --- ### 2. Functional Description The "Hex Inverter" designation means the chip contains **six** separate circuits that perform the NOT logic function (reversing the signal). The "Schmitt Trigger" feature is the most critical aspect of this specific part: * **Hysteresis:** It has different threshold levels for positive-going and negative-going signals. * **Noise Immunity:** It can transform slowly changing or "noisy" input signals into sharply defined, jitter-free digital square waves. * **Pulse Shaping:** It is commonly used to clean up signals from sensors or mechanical switches (de-bouncing). --- ### 3. Pinout Configuration The MC74ACT14NG uses a standard 14-pin layout: | Pin Number | Function | Description | | :--- | :--- | :--- | | 1, 3, 5, 9, 11, 13 | **A1 - A6** | Data Inputs | | 2, 4, 6, 8, 10, 12 | **Y1 - Y6** | Inverted Outputs | | 7 | **GND** | Ground (0V) | | 14 | **$V_{CC}$** | Power Supply (Typically 5V) | --- ### 4. Implementation Example (Basic Oscillator) Because of the Schmitt Trigger inputs, this chip can be used to create a simple **RC Relaxation Oscillator** with minimal components. ```c // Simplified Logic Diagram for one gate: // Input (A) ----[ Schmitt Trigger Inverter ]----> Output (Y) // Truth Table: // Input A | Output Y // --------|--------- // Low | High // High | Low ``` --- ### 5. Why use the "ACT" Series? The **ACT** family is designed to be compatible with standard TTL (Transistor-Transistor Logic) voltage levels while maintaining the low power consumption of CMOS technology. If you are interfacing older 5V TTL logic with modern CMOS components, the MC74ACT14NG is an ideal bridge.