The **U74LVC574G-R20-R** is a high-performance CMOS octal edge-triggered D-type flip-flop with 3-state outputs. It belongs to the **LVC (Low Voltage CMOS)** family, which is designed for high-speed, low-voltage operation. --- ### ## Technical Specifications Below are the primary parameters for the U74LVC574G-R20-R: | Parameter | Specification | |:---|:---| | **Function** | Octal D-Type Flip-Flop (8-bit) | | **Trigger Type** | Positive-Edge Triggered | | **Output Type** | 3-State (Tri-state) | | **Supply Voltage (Vcc)** | 1.65V to 3.6V | | **Logic Level** | LVTTL / LVCMOS compatible | | **Current Output** | ±24 mA at 3.0V | | **Operating Temp** | -40°C to +125°C | | **Package** | TSSOP-20 (Standard for "R20" suffix) | --- ### ## Pin Functionality The device consists of eight edge-triggered D-type flip-flops. On the positive transition of the clock (CLK), the $Q$ outputs are set to the states of their corresponding $D$ inputs. 1. **OE (Output Enable):** When LOW, the outputs are active. When HIGH, the outputs are in a high-impedance state (Hi-Z), allowing multiple devices to share the same bus. 2. **CLK (Clock):** Data is latched on the **rising edge** of the clock signal. 3. **D0-D7:** Data input pins. 4. **Q0-Q7:** Data output pins. --- ### ## Key Features * **5V Tolerance:** The inputs can handle up to 5.5V even when the supply voltage is 3.3V, making it an excellent **level shifter** between 5V and 3.3V systems. * **Low Power Consumption:** Uses CMOS technology to minimize static power dissipation. * **High Drive Capability:** Capable of driving heavy capacitive loads or low-impedance backplanes. * **Ioff Circuitry:** Supports partial-power-down mode operation; the circuitry prevents damaging current backflow through the device when it is powered down. --- ### ## Application Circuit Example In digital systems, this part is frequently used as an **Output Port** or **Buffer** for a microprocessor bus. ```c // Logic Truth Table // L = Low, H = High, Z = High Impedance, ↑ = Low-to-High Transition [ OE ] [ CLK ] [ D ] | [ Q ] --------------------------- L ↑ H | H L ↑ L | L L L or H X | Q0 (No Change) H X X | Z ``` ---