onsemi

74F161ASJX

74F161ASJX Description

The 74F161ASJX is a 4-bit synchronous binary counter from onsemi's 74F series, designed for high-speed digital applications. Operating within a 4.5V to 5.5V supply range, it features a 120 MHz count rate, making it suitable for high-frequency timing and control systems. This surface-mount (16-SOP) IC offers synchronous operation with positive-edge triggering, ensuring precise timing coordination in complex circuits. Its asynchronous reset allows immediate initialization, while the up-counting direction simplifies sequential logic design. Although marked as obsolete, it remains relevant in legacy systems due to its robust performance and REACH compliance.

74F161ASJX Features

• High-Speed Performance: 120 MHz count rate enables efficient operation in fast-paced digital systems.
• Synchronous Counting: Ensures all flip-flops transition simultaneously, reducing skew and improving reliability.
• Asynchronous Reset: Immediate clearing of the counter independent of the clock signal.
• Wide Voltage Range: Operates at 4.5V–5.5V, compatible with standard TTL levels.
• Surface-Mount Package: 16-SOP encapsulation suits compact PCB designs.
• Low Sensitivity: MSL 1 (Unlimited) ensures durability during storage and handling.

74F161ASJX Applications

• Frequency Dividers: Ideal for clock division in communication systems.
• Digital Timers/Counters: Used in industrial automation and instrumentation.
• Sequential Logic Circuits: Integrates into state machines and control units.
• Legacy System Maintenance: Replaces older counters in (maintenance) of vintage electronics.
• Test Equipment: Provides precise counting in signal generators and analyzers.

Conclusion of 74F161ASJX

The 74F161ASJX excels in high-speed, synchronous counting applications, offering low-latency performance and easy integration. While obsolete, its 120 MHz capability and asynchronous reset make it a pragmatic choice for legacy upgrades or niche designs requiring 4-bit binary counting. Engineers valuing timing precision and TTL compatibility will find it a reliable component, particularly in frequency division and digital control systems.