100 MHz frequency and period counter using the Intersil ICM7226B 40 pin DIP

Description: A 100 MHz frequency and period counter is constructed using the Intersil ICM7226B in a 40-pin DIP package. This circuit incorporates a CD4016 analog multiplexer to route the digital outputs back to the function input. The CD4016 operates as a digitally controlled analog transmission gate, eliminating the need for level shifting of the digital output. Alternatively, CD4051 or CD4052 multiplexers can be utilized to select the appropriate inputs for the multiplexed input on the ICM7226 from 2- or 3-bit digital inputs. These analog multiplexers can also be integrated into systems where the operational mode is governed by a microprocessor instead of being directly controlled by front panel switches (courtesy Intersil, Inc.).

The 100 MHz frequency and period counter circuit is designed to provide accurate measurements of frequency and time intervals, making it suitable for a variety of applications in electronics testing and measurement. The ICM7226B is a versatile integrated circuit capable of high-speed counting, with features that allow for easy integration into different circuit configurations.

The CD4016 analog multiplexer serves as a key component in this design, enabling the selection of different digital outputs without the need for additional level shifting circuitry. This feature simplifies the design and reduces component count, enhancing reliability and performance. The ability to use CD4051 or CD4052 multiplexers provides flexibility in selecting inputs, allowing the circuit to accommodate various signal types and sources.

In systems where a microprocessor is utilized, the multiplexers can be controlled via digital signals, allowing for dynamic selection of inputs based on operational requirements. This capability is particularly useful in automated testing environments where multiple signals may need to be monitored or processed without manual intervention.

Overall, this circuit design exemplifies efficient use of integrated circuits and multiplexing techniques to achieve high-performance frequency and period measurement, suitable for both laboratory and industrial applications.100 MHz frequency and period counter using the Intersil ICM7226B 40-pin DIP. This circuit uses a CD4016 analog multiplexor to multiplex the digital outputs back to the function input. Since the CD4016 is a digitally controlled analog transmission gate no level shifting of the digital output is required.

CD4051s or CD4052s could also be used to sel ect the proper inputs for the multiplexed input on the ICM7226 from 2-or 3-bit digital inputs. These analog multiplexers could also be used in systems in which the mode of operation is controlled by a microprocessor rather than directly by front panel switches (courtesy Intersil, Inc. ).