The T74LS191B1 is a high-speed 4-bit binary counter from STMicroelectronics, designed with Low Power Schottky technology. This integrated circuit is capable of counting both up and down, providing versatility in various applications such as computing, control systems, and digital data processing. It is part of the 74LS logic family, known for its low power consumption and high-speed performance.

Key Features

• Counting Modes: The device offers both synchronous up and down counting capabilities, allowing for flexible counting sequences in either direction.
• Output Frequency: It has a high output frequency and a fast propagation delay, making it suitable for high-speed operations.
• Expandability: Multiple counters can be connected in cascade, enabling the counting of longer sequences without compromising speed.
• Direct Clear: The counter includes a direct clear function, which allows for the immediate resetting of the count to zero.
• Load Capability: It features a parallel load capability to preset the counter to a desired value.
• Low Power Consumption: As a member of the 74LS family, it is designed for low power consumption, making it energy efficient.
• Dual Mode: The T74LS191B1 can operate in either a hold (do nothing) mode or a count (up or down) mode, as determined by the mode control inputs.

Applications

The T74LS191B1 is well-suited for a variety of applications where precise counting is required. It is commonly used in:

• Digital clocks and timers
• Frequency dividers
• Programmable counters
• Sequence generators
• Industrial controls

Technical Specifications

The device operates within a supply voltage range of 4.75V to 5.25V, with a typical supply voltage of 5V. It is available in a DIP (Dual In-line Package) or SOP (Small Outline Package), providing flexibility for various PCB layouts and design considerations.

For detailed technical specifications, application notes, and support documentation, please refer to the official STMicroelectronics T74LS191B1 datasheet available on the STMicroelectronics website.