NXP 74HC191 Product Overview

The NXP 74HC191 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL). It is a versatile 4-bit synchronous up/down binary counter that is designed to provide robust performance in a wide range of applications. This integrated circuit is part of the 74HC/HCT family, well-known for its high noise immunity and low power consumption.

Key Features

• Synchronous Reversible 4-bit Binary Counting: The 74HC191 can count both upwards and downwards, providing flexibility in binary counting applications.
• Dual Clock Inputs: Separate up (UP) and down (DOWN) clock inputs allow the counter to be used in a variety of configurations and applications.
• Asynchronous Master Reset: The device includes an asynchronous master reset input (MR) that resets the counter to its zero state, providing an easy way to clear the counter whenever necessary.
• Expandability: The counters can be easily cascaded by feeding the ripple carry output to the enable input of the subsequent counter for applications requiring longer count sequences.
• Output Capability: The 74HC191 can drive up to 15 LSTTL loads, making it suitable for interfacing with other logic families.
• Wide Operating Voltage: It operates on a wide range of voltage from 2V to 6V, providing compatibility with various systems and ensuring reliable operation.

Applications

The 74HC191 is widely used in electronic systems where a precise and reliable counter is needed. Its applications include:

• Industrial control systems
• Instrumentation and test equipment
• Automated systems
• Process counters
• Digital clocks and timers

Quality and Reliability

NXP Semiconductors is known for its commitment to quality and the 74HC191 is no exception. It is manufactured to the highest standards, ensuring that it meets the rigorous demands of industrial and commercial use. With its robust design and proven technology, the NXP 74HC191 is a reliable choice for designers looking to implement a high-performance counter in their systems.