The **U74LVC573L-R20-T** is a high-performance CMOS device featuring octal transparent D-type latches with 3-state outputs. It belongs to the Low-Voltage CMOS (LVC) family, commonly used in modern digital systems for bus-oriented applications. --- ## 1. Technical Specifications Below are the primary electrical characteristics and physical parameters of the component: | Parameter | Specification | | :--- | :--- | | **Logic Family** | LVC (Low-Voltage CMOS) | | **Function** | Octal Transparent D-Type Latch | | **Supply Voltage (Vcc)** | 1.65V to 3.6V | | **Output Type** | 3-State (High Impedance) | | **Drive Capability** | ±24 mA at 3.0V | | **Propagation Delay** | ~3.5 ns (typical at 3.3V) | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | TSSOP-20 (R20) | --- ## 2. Pin Functionality The device contains 20 pins, designed to handle 8 bits of data simultaneously. ### Key Control Pins: * **LE (Latch Enable):** When High, the outputs follow the data inputs (Transparent mode). When Low, the data is latched and held. * **$\overline{OE}$ (Output Enable):** When Low, the latched data is present at the outputs. When High, the outputs enter a high-impedance state (OFF), allowing multiple devices to share a single bus. * **D0 - D7:** Data Inputs. * **Q0 - Q7:** Data Outputs. --- ## 3. Key Features and Advantages ### Low Voltage & High Speed The LVC technology allows the chip to operate at very high speeds (comparable to 5V TTL) while consuming significantly less power. It is ideal for battery-powered or energy-efficient electronics. ### 5V Tolerant Inputs A critical feature of the U74LVC series is that the inputs are **5V tolerant**, even when the device is powered at 3.3V. This makes it an excellent "level shifter" or interface between older 5V logic and modern 3.3V logic. ### 3-State Outputs The outputs can be put into a high-impedance state. This is essential for **Bus-Organized Systems**, where multiple chips send data to the same CPU or memory bus. --- ## 4. Typical Applications * **Microprocessor Interfacing:** Used to buffer or latch address/data lines from a CPU. * **Memory Controllers:** Temporary storage of data during read/write cycles. * **Bus Drivers:** Driving signals across long PCB traces or to multiple peripheral devices. * **Logic Level Shifting:** Connecting 5V sensors/logic to 3.3V microcontrollers. --- ## 5. Part Number Breakdown (UTC Naming Convention) * **U74LVC:** UTC Low-Voltage CMOS Logic Series. * **573:** Functional logic code (Octal Latch). * **L:** Lead-free/Halogen-free. * **R20:** Package code (TSSOP-20). * **T:** Packing type (Tape & Reel or Tube, usually Tape).