NXP 74HC367D: A Detailed Overview of the Hex Bus Buffer IC

The NXP 74HC367D is a member of the widely adopted 74HC family of high-speed CMOS logic integrated circuits. Functioning specifically as a hex non-inverting bus buffer, this IC is a fundamental component in digital systems where signal isolation, amplification, and bus management are critical. It is designed to interface with higher-capacitance loads or to serve as an extra source of current for high-demand bus lines, making it indispensable in complex digital architectures.

Housed in a standard 16-pin SOIC (Small Outline Integrated Circuit) package, the 74HC367D contains six independent buffer gates. A key feature of this IC is its tri-state output capability, which allows the outputs to be effectively disconnected from the bus, putting them into a high-impedance state (Hi-Z). This is crucial for preventing data collisions on bidirectional data buses common in microprocessors, memory systems, and various peripheral interfaces. The device includes two active-low output enable pins (OE1 and OE2), each controlling three buffers. This grouped control provides flexibility, enabling sections of the device to be independently activated or disabled as needed.

Operating from a wide power supply range of 2.0 to 6.0 volts, the 74HC367D is compatible with a variety of logic levels, including classic 5V TTL and lower-voltage systems. Despite its CMOS construction, it offers TTL-compatible inputs, ensuring seamless integration into mixed-technology environments. Its high-speed operation, with typical propagation delays of just 12 ns, ensures minimal impact on system timing, while its robust output drive can source or sink up to 4 mA, sufficient to drive multiple inputs.

Typical applications for the 74HC367D are extensive. It is commonly used for bus driving and signal buffering in computer motherboards, data acquisition systems, and network equipment. It acts as a line driver to extend the transmission distance of signals and is vital in preventing noise from affecting sensitive circuit sections. Its non-inverting nature means it preserves the logic state of the signal, only serving to amplify its current and voltage characteristics.

ICGOOODFIND: The NXP 74HC367D stands out as a reliable and efficient solution for digital bus management. Its combination of high-speed performance, tri-state control, and robust drive strength makes it a versatile choice for designers needing to ensure signal integrity and prevent bus contention in a wide array of electronic applications.

Keywords: Hex Bus Buffer, Tri-State Output, High-Speed CMOS, Bidirectional Data Bus, Output Enable.