NXP 74HC240PW: Octal Inverting Buffer/Line Driver with 3-State Outputs

The NXP 74HC240PW is a high-performance integrated circuit belonging to the 74HC family, designed as an octal inverting buffer/line driver with 3-state outputs. This device is engineered to provide robust signal conditioning and driving capabilities in a wide array of digital systems. Housed in a TSSOP-20 package, it is particularly suited for space-constrained applications where efficient PCB layout is critical.

The core functionality of the 74HC240PW revolves around its eight inverting buffers. Each buffer takes an input signal and provides its complementary inverted output, which is essential for applications requiring logic level inversion. A key feature of this IC is its 3-state outputs, which can be switched to a high-impedance state. This allows multiple devices to share a common bus without interference, making it ideal for bidirectional data communication in bus-oriented systems like microprocessors or memory interfaces.

The device is divided into two groups of four buffers, each controlled by a separate output enable pin (OE1 and OE2). When the OE pin is driven low, the outputs are active; when driven high, the outputs enter the high-impedance state. This independent control enhances design flexibility, enabling partial system operation or power-saving modes.

Constructed with high-speed CMOS technology, the 74HC240PW offers low power consumption while maintaining high noise immunity and the ability to drive relatively high capacitive loads. It operates over a broad voltage range (2 V to 6 V), making it compatible with various logic families and power supply configurations.

Typical applications include memory address driving, bus buffering, waveform generation, and general-purpose logic inversion where signal integrity and load driving capacity are paramount.

ICGOODFIND: The NXP 74HC240PW is a versatile and reliable solution for digital systems demanding signal inversion, high-drive strength, and efficient bus management in a compact form factor.

Keywords:

3-State Outputs

Octal Inverting Buffer

Line Driver

High-Speed CMOS

Output Enable