The TC74HC191AF(EL) is a high-speed CMOS synchronous 4-bit Binary Up/Down Counter manufactured by Toshiba Semiconductor and Storage. This device is designed for use in high-performance digital systems requiring binary counting and features synchronous counting operation, enabling predictable and reliable performance. It's part of the broader TC74HC series, known for its compatibility with TTL logic levels and low power consumption, making it suitable for a wide array of applications.

Applications

• Frequency Dividers: Used to divide an input frequency by a specific factor.
• Digital Clocks: Implements counting functions for timekeeping.
• Up/Down Counters: Functions as a counter in both ascending and descending modes.
• Address Generation: Generates memory addresses in digital systems.
• Programmable Counters: Configured for custom counting sequences.

Features

• High-Speed Operation: Provides rapid counting operations due to CMOS technology.
• Synchronous Counting: All flip-flops are clocked simultaneously, preventing timing skew.
• Up/Down Control: Selectable up or down counting modes.
• Ripple Carry Output: Facilitates cascading multiple counters for higher bit counts.
• Clear Input: Resets the counter to a predefined state.
• Low Power Consumption: Operates with minimal power draw.
• Wide Operating Voltage Range: Operates reliably over a broad voltage range.

Benefits

• Improved System Performance: High-speed operation minimizes delays in counting applications.
• Simplified System Design: Synchronous operation simplifies timing considerations.
• Versatile Counting Modes: Up/down control broadens the range of possible applications.
• Expandable Counting Capacity: Ripple carry output allows for easy cascading.
• Reliable Operation: CMOS technology provides stable performance over temperature and voltage variations.
• Energy Efficiency: Low power consumption reduces overall system power requirements.

Additional Details

The TC74HC191AF(EL) is typically supplied in a surface-mount package (SOIC). It operates from a supply voltage of 2V to 6V. The operating temperature range is typically -40°C to +85°C. The device features a master reset (clear) input and a count enable input for flexible control of the counting operation. The synchronous counting eliminates output glitches, ensuring stable output signals. The ripple carry output allows cascading multiple devices to create counters with larger bit widths. The 'EL' suffix usually indicates specific packaging or tape and reel options for automated assembly. The inputs are TTL compatible.