TC74VHC4040FK(EL,K

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The TC74VHC4040FK is a dual modulus down-counter with a microcomputer-compatible synchronization-reset feature belonging to the Logic - Counters, Dividers family. It features a five-stage ripple carry down-counter with a maximum count of 32K which is synchronized with a reset for the elimination of noise problems. The counter is latchable by external clock pulse or by synchronized-reset. The reset can be controlled by external signals or by manual control. It has two outputs, one for CPU synchronization, and one for interrupt signals. The clocking rate is generally very low, with normal operation having a frequency of up to 1 MHz.

The higher division ratio of the TC74VHC4040FK enables very precise division factor selection through the division rate of 32K which provides a very large selection of division ratios. By connecting the two outputs to separate clock sources, the division ratio can be enhanced considerably by creating two or more division ratios. The division rate of 32K also offers the advantage of large division numbers, allowing for more precise division than with a division ratio of just 16K. The division range can be further increased by using cascade mode, which allows for division to be performed by multiple cascaded counters.

The TC74VHC4040FK utilizes a SYNC-RESET function which keeps the counter in a RESET state when a synchronizing pulse is applied. This circuit prevents any noise interference on the output signal between the RESET and CLOCK inputs. The SYNC-RESET is a two-stage circuit which first sets the RESET signal high and then sets the CLOCK signal low. It is important for designers to note that the counter can be driven either with a synchronizing pulse or a reset signal, depending on its usage.

The TC74VHC4040FK features an Asynchronous High-Speed Output (AHO) function which supports high-speed counting. The AHO pin can be configured to output either the latch signal or the count signal. With the AHO configured as the latch signal, the output signal is triggered as soon as a reset is inputted. This ensures that the output signal is always updated as soon as a reset signal is applied. With the AHO configured as the count signal, the output signal is triggered when the count signal reaches the desired value. This helps prevent any misfires of the output signal which might result in erroneous data.

The TC74VHC4040FK also features a SYNC-RESET signal which is used to reset the counter. This signal is synchronized to the reset period of the counter, thus preventing any-noise interference to occur between the reset and clock inputs. The SYNC-RESET signal ensures that the counter will be reset at the same time as the external reset signal, thus providing reliable operation and decreased response times. Additionally, with this synchronized reset, the counter can be synchronized with the CPU.

The TC74VHC4040FK is a very versatile and powerful counter that finds its usage in many applications. It can be used for dividing frequencies, detecting overflows, controlling analog-to-digital conversion and as a high-speed counter for counter-timing, measuring devices, waveform generators, and more. With its wide range of features, it is easy to see why the TC74VHC4040FK is considered one of the premier counters in its class.

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