ON Semiconductor MC74HC240AN Octal 3-State Inverting Buffer/Line Driver

The MC74HC240AN is a high-performance integrated circuit manufactured by ON Semiconductor, renowned for its reliability and versatility in various digital applications. This device is an octal 3-state inverting buffer/line driver designed to interface with 8-bit bus systems. Its robust construction and advanced technology make it a suitable choice for a wide range of applications, including driving bus lines, buffer memory address registers, and as a general-purpose logic element in sophisticated digital systems.

Constructed with silicon gate CMOS technology, the MC74HC240AN offers the high noise immunity and low power consumption that are hallmarks of CMOS integrated circuits. It also has the added advantage of being compatible with LSTTL outputs, which allows it to be used in systems that incorporate both CMOS and TTL logic. This feature is particularly useful for designers looking to upgrade their systems without the need to completely overhaul existing TTL components.

The device features eight inverting buffers with 3-state outputs, providing the ability to drive bus lines or buffer memory with high efficiency. The 3-state outputs allow the buffers to be in one of three conditions: active high, active low, or in a high-impedance state. This high-impedance state ensures that the outputs effectively disconnect from the bus line, preventing any interference when other devices are driving the bus.

Each buffer on the MC74HC240AN is capable of sinking 20 mA and sourcing −20 mA, making it suitable for driving moderately high-current loads. It operates over a wide voltage range of 2V to 6V, providing the flexibility needed to accommodate different logic level requirements. The chip is also characterized for operation from -55°C to 125°C, ensuring reliable performance even in extreme temperature environments.

The MC74HC240AN comes in a standard 20-pin DIP (Dual In-line Package), which makes it easy to integrate into both prototyping breadboards and final product PCBs. Its pin configuration is carefully designed to minimize the likelihood of crosstalk, which is critical for maintaining signal integrity in high-speed digital circuits.

In summary, the MC74HC240AN from ON Semiconductor is a versatile and reliable choice for designers looking for an octal buffer/line driver with 3-state outputs, low power consumption, and compatibility with LSTTL levels.