The 74AC161 from STMicroelectronics is a high-speed, 4-bit binary counter chip that is part of the 74AC series, known for its advanced high-speed CMOS technology. This integrated circuit is designed to count up from zero to fifteen in binary (0000 to 1111) and includes a synchronous reset feature for enhanced functionality.

Key Features

• Synchronous Counting: The 74AC161 provides synchronous counting, which ensures that the output changes coincide with the clock's rising edge, leading to precise timing and improved performance in digital circuits.
• Asynchronous Reset: An asynchronous reset input allows the counter to be quickly and immediately reset to zero, regardless of the clock input, providing a convenient way to restart the count at any given time.
• Output Capability: With its robust output drive, the 74AC161 can directly drive load lines, making it suitable for a variety of digital applications that require high current driving capability.
• Look-Ahead Carry Output: The look-ahead carry output feature allows for fast counting in multi-stage counter configurations by enabling cascading of multiple counters without additional gating.
• High-Speed Operation: Characteristic of the 74AC series, the 74AC161 operates at high speeds, making it an ideal choice for high-speed machine operations and digital processing systems.

Applications

The 74AC161 is versatile and can be implemented in a wide range of applications, including:

• Industrial control systems
• High-speed internal machine counters
• Frequency division applications
• Timers and time delay circuits
• Programmable dividers

Technical Specifications

Some of the technical specifications of the 74AC161 include:

• Supply Voltage Range: 2.0V to 6.0V
• Operating Temperature Range: -40°C to 85°C
• Propagation Delay Time: Typically 4.5ns at 5V
• Power Dissipation Capacitance: Typically 20 pF

For detailed information, designers and engineers are encouraged to consult the datasheet provided by STMicroelectronics, which includes comprehensive technical details, pin configurations, timing diagrams, and application notes for the 74AC161 binary counter.