The 74HC191D is a high-speed Si-gate CMOS device and is pin compatible with low-power Schottky TTL (LSTTL). Manufactured by NXP Semiconductors, it is part of the 74HC family, which is well-known for its robustness and compatibility across a wide range of applications.

Key Features

• Counting Sequence: The 74HC191D is a presettable synchronous 4-bit binary up/down counter that features a reversible counting sequence, providing versatility in control and calculation operations.
• Logic Family: As a member of the 74HC family, this device operates with a high-current output capability and symmetrical output impedance, making it suitable for interfacing with TTL logic levels.
• Power Supply: It has a wide operating voltage range from 2.0V to 6.0V, which allows it to be used in various systems without the need for level shifting.
• Speed Performance: The 74HC191D is known for its high-speed performance, which ensures minimal propagation delays and efficient operation in high-frequency counting applications.
• Packaging: It comes in a standard SOIC-16 package, making it easy to integrate into surface-mounted PCB designs.

Applications

The 74HC191D is utilized in a wide range of electronic applications due to its versatile nature. It is commonly found in:

• Industrial control systems
• Robotics
• Data processing
• Instrumentation
• Automotive electronics

Additional Information

For design engineers and electronics enthusiasts, the 74HC191D offers a reliable and efficient solution for digital counting needs. The device includes features such as a master reset to clear the counter, parallel load capability for presetting the counter to any desired value, and count enable inputs to control the counter operation. The outputs are capable of driving 15 LSTTL loads, which is indicative of the robust output drive capability of this device.

With its proven performance and NXP's commitment to quality, the 74HC191D is an excellent choice for those looking to implement a reliable counting mechanism in their digital circuits.