## Technical Overview: XC7SET125GV The **XC7SET125GV** is a high-speed, Si-gate CMOS device commonly used as a non-inverting buffer/line driver. It belongs to the 7SET family, which is specifically designed to bridge the gap between TTL (Transistor-Transistor Logic) and CMOS voltage levels. --- ### 1. Key Features and Specifications | Parameter | Specification | | :--- | :--- | | **Function** | Bus Buffer/Line Driver (Non-Inverting) | | **Input Type** | TTL Level Compatible | | **Output State** | 3-State (High, Low, High-Impedance) | | **Voltage Supply (Vcc)** | 4.5V to 5.5V | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | SC-74A / SOT453 (5-pin plastic) | | **Output Current** | 8mA (at 4.5V) | --- ### 2. Pin Configuration The device typically features 5 pins. Below is the functional mapping for the GV (SC-74A) package: | Pin Number | Symbol | Description | | :--- | :--- | :--- | | 1 | **OE** | Output Enable (Active LOW) | | 2 | **A** | Data Input | | 3 | **GND** | Ground (0V) | | 4 | **Y** | Data Output | | 5 | **Vcc** | Supply Voltage | --- ### 3. Logic Truth Table The XC7SET125 features a 3-state output controlled by the Output Enable ($\overline{OE}$) pin. | Input $\overline{OE}$ | Input A | Output Y | | :---: | :---: | :---: | | L | L | L | | L | H | H | | H | X | **Z (High Impedance)** | *Note: L = Low, H = High, X = Don't Care, Z = High Impedance.* --- ### 4. Application Use Cases * **Voltage Level Shifting:** Because the input thresholds are TTL-compatible, it is often used to interface 3.3V logic signals into 5V CMOS systems. * **Bus Isolation:** The 3-state output allows multiple devices to share the same transmission line without interference when the buffer is disabled. * **Signal Buffering:** Used to provide additional current drive for signals traveling over long PCB traces or to multiple loads. --- ### 5. Part Number Suffix "125" In the context of Nexperia/TI naming conventions, the **"125"** usually refers to: 1. **The Logic Function:** The "125" identifies it specifically as a non-inverting buffer with an active-low enable. 2. **Packaging/Packing:** In many distributor listings, "125" appended at the very end (e.g., `XC7SET125GV,125`) refers to the **tape and reel** quantity or specific reel diameter (e.g., 7-inch reel).