CD74HC161 High-Speed CMOS Logic Presettable Counter

The CD74HC161 is a high-speed synchronous modulo-16 binary counter designed and manufactured by Texas Instruments. This integrated circuit is a part of the high-speed CMOS logic family and boasts a robust set of features that make it suitable for a wide range of applications including timers, frequency dividers, and general-purpose counters in computing and digital systems.

Constructed with silicon gate CMOS technology, the CD74HC161 ensures low power consumption while maintaining high speed. It operates at a voltage range of 2V to 6V, providing a flexible power supply option suitable for various electronic environments. The device also features a typical clock frequency of 32MHz at 5V, making it an excellent choice for high-speed operations.

One of the key features of the CD74HC161 is its presettable capability, which allows the counter to be programmed to a desired initial state. It can be loaded with a 4-bit binary word using the parallel load inputs (P0, P1, P2, P3) and the preset enable (PE) input. Additionally, the counter can be cleared to zero by a high level on the clear input (CLR).

The CD74HC161 also includes a synchronous reset feature for the counter, which can be triggered by the master reset (MR) input. This synchronous reset ensures that the counter can be reset as part of the system's synchronous operation, without the need for additional timing controls.

The outputs of the CD74HC161 are available from the four flip-flops (Q0, Q1, Q2, Q3) and provide both true and complement outputs, increasing the flexibility in system design. The counter advances on the falling edge of the clock (CP) input, and the maximum clock frequency can vary with the operating voltage.

Overall, the CD74HC161 from Texas Instruments is a reliable and efficient solution for designers looking to implement counters with presetting and synchronous reset capabilities in their digital systems. Its high-speed performance, coupled with low power consumption and versatile power supply options, make it an ideal choice for modern electronic applications.