STMicroelectronics 74LCX574TTR Low Voltage Octal D-Type Flip-Flop with 5V Tolerant Inputs/Outputs

The 74LCX574TTR from STMicroelectronics is a high-performance, low-voltage Octal D-Type Flip-Flop integrated circuit with 5V tolerant inputs and outputs, designed to operate particularly well in 3.3V VCC operation while providing 5V tolerant I/Os. This feature allows for the seamless interfacing with 5V logic levels in mixed-voltage systems, making the 74LCX574TTR an ideal choice for facilitating communication between different voltage domains in a variety of digital applications.

Constructed with advanced silicon-gate CMOS technology, the 74LCX574TTR offers optimal power and speed characteristics. The device features eight edge-triggered flip-flops with individual D-type inputs and 3-state outputs. The flip-flops go to the state of their respective D inputs upon a positive transition of the clock (CLK) input. A direct clear (CLR) input is also provided to simultaneously clear all flip-flops to a low state.

The 3-state outputs are designed for low capacitive loading, which makes them suitable for driving long lines, buses, or for interfacing with high-capacity memory systems. The outputs can also be placed in a high impedance state (effectively disengaged from the circuit) by applying a high logic level to the Output Enable (OE) input, allowing for more flexibility in bus management and system design.

Key features of the 74LCX574TTR include:

• 5V tolerant inputs and outputs for interfacing with 5V logic
• High-speed operation: t_PD 4.5 ns (max.) at V_CC = 3.3V
• Power-down high impedance inputs and outputs
• Support for live insertion and withdrawal (no glitch on power up/down)
• Support for bus hold on data inputs, eliminating the need for external pull-up resistors
• Low quiescent current: I_CC = 4µA (max.)
• Lead-free, 20-lead TSSOP package for reduced space requirements

With its robust design and advanced features, the 74LCX574TTR is particularly well-suited for implementation in memory registration, buffering, and control systems, as well as in applications where low power consumption and high data integrity are required. Its compatibility with both 3.3V and 5V systems, along with its power-saving technology, makes it a versatile and reliable component for modern electronic designs.