The **U74LVC563G-P20-R** is a high-performance CMOS integrated circuit manufactured by Unisonic Technologies (UTC). It is an **Octal Transparent D-Type Latch** featuring 3-state outputs and inverting logic. --- ### 1. General Specifications This device belongs to the **LVC** (Low Voltage CMOS) family, which is designed for high-speed operation at lower voltage levels compared to standard TTL or older CMOS families. | Feature | Specification | | :--- | :--- | | **Logic Type** | Octal Transparent D-Type Latch | | **Logic Family** | LVC (Low Voltage CMOS) | | **Output Type** | Inverting, 3-State | | **Operating Voltage ($V_{CC}$)** | 1.65V to 3.6V | | **Package Type** | TSSOP-20 (indicated by P20) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Description The U74LVC563 contains eight separate latches. When the **Latch Enable (LE)** input is HIGH, the outputs follow the data at the inputs in an inverted state. When LE is LOW, the data is latched and held at the outputs. The **Output Enable ($\overline{OE}$)** input controls the state of the outputs: * **When $\overline{OE}$ is LOW:** The device is in active mode, providing the inverted logic of the latched data. * **When $\overline{OE}$ is HIGH:** The outputs enter a high-impedance (Hi-Z) state, effectively disconnecting them from the bus. --- ### 3. Pin Configuration (TSSOP-20) | Pin No. | Name | Description | | :--- | :--- | :--- | | 1 | $\overline{OE}$ | Output Enable Input (Active Low) | | 2 - 9 | D0 - D7 | Data Inputs | | 11 | LE | Latch Enable Input | | 12 - 19 | $\overline{Q}7 - \overline{Q}0$ | Inverting Outputs | | 10 | GND | Ground | | 20 | $V_{CC}$ | Supply Voltage | --- ### 4. Key Features & Applications * **5V Tolerance:** The inputs and outputs can withstand up to 5.5V, allowing the chip to act as a level translator between 3.3V and 5V systems. * **High Drive Capability:** Designed to drive high-capacitance loads or bus-oriented systems. * **Power-Down Mode:** Supports $I_{off}$ circuitry, which disables outputs when the device is powered down to prevent damaging backflow current. **Common Applications:** * Microprocessor system buffering. * Memory address/data latching. * Bus-oriented data transmission. ---