Texas Instruments

CD74AC161E

CD74AC161E Description

The CD74AC161E from Texas Instruments is a high-performance 4-bit synchronous binary counter designed for precision counting applications. Operating within a 1.5V to 5.5V supply range, this device supports 90 MHz count rates, making it suitable for high-speed digital systems. Housed in a 16-pin DIP (Through Hole) package, it features synchronous operation with positive-edge triggering and asynchronous reset for immediate clearing. The 74AC series ensures low power consumption and high noise immunity, while its ROHS3 compliance and REACH unaffected status make it environmentally friendly.

CD74AC161E Features

• 4-bit binary counter with up-counting direction for sequential logic applications.
• Synchronous timing ensures precise clock-driven operation, reducing skew in multi-device systems.
• Asynchronous reset allows immediate counter clearing independent of the clock signal.
• Wide voltage range (1.5V–5.5V) enables compatibility with 3.3V and 5V logic systems.
• High-speed performance (90 MHz) outperforms many standard TTL/CMOS counters.
• Low-power AC-series technology reduces energy consumption without sacrificing speed.
• Through-hole mounting (DIP-16) simplifies prototyping and legacy system integration.

CD74AC161E Applications

The CD74AC161E is ideal for:

• Frequency dividers in clock management circuits.
• Digital event counters in industrial automation and instrumentation.
• State machine control in embedded systems and microcontrollers.
• Address generation for memory interfacing and data routing.
• Pulse sequencing in communication and signal processing systems.
  Its high-speed operation and synchronous design make it particularly valuable in real-time control systems, FPGA/CPLD peripherals, and high-reliability military/aerospace electronics.

Conclusion of CD74AC161E

The CD74AC161E stands out as a versatile, high-speed binary counter with robust performance across a wide voltage range. Its synchronous operation, asynchronous reset, and 90 MHz capability provide superior flexibility compared to older 74HC or 74LS variants. Whether used in precision timing, digital logic, or high-speed counting, this device delivers reliability, efficiency, and compliance with modern environmental standards, making it a top choice for engineers in industrial, automotive, and telecommunications applications.