The **U74LVC563L-P20-R** is a high-performance CMOS integrated circuit designed for low-voltage applications. It functions as an **Octal Transparent Datalatch** with 3-state outputs and inverted logic. --- ## 1. Technical Specifications Below are the key electrical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Logic Type** | Octal Transparent Datalatch | | **Output Type** | 3-State (Inverting) | | **Supply Voltage ($V_{CC}$)** | 1.65V to 3.6V | | **Operating Temperature** | -40°C to +85°C | | **Drive Capability** | ±24 mA at 3.0V | | **Package Type** | TSSOP-20 (indicated by P20) | | **Logic Family** | LVC (Low Voltage CMOS) | --- ## 2. Pin Configuration & Functionality The device contains eight D-type latches. When the Latch Enable (LE) is high, the outputs follow the (inverted) data at the inputs. When LE is low, the data is latched. ### Key Control Pins: * **D0 - D7:** Data Inputs. * **$\overline{Q0} - \overline{Q7}$:** Inverted Data Outputs. * **LE (Latch Enable):** When High, the latch is "transparent." When Low, data is stored. * **$\overline{OE}$ (Output Enable):** When Low, outputs are active. When High, outputs are in a high-impedance (Hi-Z) state. --- ## 3. Truth Table The operation of the U74LVC563L is defined by the following logic states: | Operating Mode | $\overline{OE}$ | LE | D | Output ($\overline{Q}$) | | :--- | :---: | :---: | :---: | :---: | | **Transparent** | L | H | L | H | | **Transparent** | L | H | H | L | | **Latched** | L | L | X | $Q_0$ (Previous State) | | **High Impedance** | H | X | X | Z | --- ## 4. Key Features & Applications ### Features: * **5V Tolerance:** Inputs can be driven by 5V devices even when operating at a lower $V_{CC}$. * **Low Power Consumption:** Ideal for battery-operated handheld devices. * **Bus Hold:** Often includes circuitry to hold the last known state, preventing floating inputs. ### Common Applications: 1. **Memory Address Latching:** Holding addresses for slow memory modules. 2. **I/O Expansion:** Increasing the number of output pins on a microcontroller. 3. **Bus Buffering:** Isolating different sections of a digital bus to prevent loading issues.