MC74ACT125DR2G Quad Buffer with 3-State Outputs – SOIC-14

Description

The MC74ACT125DR2G is a high-speed CMOS quad buffer featuring independent 3-state outputs. It is designed to act as a logic gate that transmits data without inversion while providing the capability to electrically disconnect its outputs from the bus—a state known as high-impedance (Hi-Z). This feature is essential for systems where multiple devices share the same data lines, preventing bus contention.

The “ACT” designation indicates that this device is designed to be TTL-compatible, allowing it to interface directly with standard TTL logic levels while maintaining the speed and low power consumption of CMOS architecture. With four independent buffers in a single package, each controlled by its own active-LOW output enable ($\overline{OE}$) pin, this IC offers granular control over signal routing.

Note: Product images are for illustrative purposes only. Because this device provides high-current drive capabilities, please consult the official ON Semiconductor datasheet for propagation delay timings and output current limits ($I_{OH}/I_{OL}$) to ensure compatibility with your specific application.

Features

• Quad Buffer: Four independent, non-inverting buffers in a single 14-pin package.
• 3-State Outputs: Each buffer features an individual active-LOW Output Enable ($\overline{OE}$) pin for bus isolation.
• TTL Compatibility: Input threshold levels are specifically designed to interface seamlessly with TTL-level digital logic.
• High Drive Capability: Capable of sourcing and sinking high currents, making it ideal for driving long bus lines.
• CMOS Efficiency: Combines high-speed operation with low power consumption and high noise immunity.
• Package: SOIC-14 (SMD) for standard surface-mount assembly.

Benefits

• Bus Conflict Prevention: The 3-state output capability allows you to safely connect multiple buffers to the same bus without shorting signals.
• Signal Conditioning: Useful for driving signals over longer distances on a PCB while maintaining clean logic levels.
• Logic Interfacing: Simplifies the integration of TTL-based components into CMOS-based high-speed systems.

Applications

• Bus-Shared Logic: Connecting multiple processors or peripherals to a common data bus.
• Signal Level Buffering: Boosting signals that need to drive high-capacitance loads.
• Control Signal Gating: Using the $\overline{OE}$ pins to enable or disable entire sections of logic at specific times.
• General Embedded Systems: Essential for protecting logic outputs and isolating signal paths in complex control hardware.

Package Includes

• 1 x MC74ACT125DR2G Quad Buffer with 3-State Outputs (SMD-14)

Specifications