SN74LS697N

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Logic – Counters, Dividers refer to integrated circuits (ICs) that can be used to count and divide signals. Among these are the SN74LS697N, a versatile IC that provides a programmable divide-by-N counter, frequency divider, and oscillator. This article outlines what this IC offers and looks at its application field and working principle.

The SN74LS697N is an 8-bit programmable divide-by-N counter and frequency divider. It includes an on-chip RC oscillator, which can be adjusted to provide four different timebase frequencies, selectable with a logic input. This allows it to provide different output frequencies without changing the number of the device, thus expanding its capabilities. In addition, the counter lets the user to program the number of counts required before an output signal is generated.

The application of the SN74LS697N can extend from simple frequency divider circuits to multi-function control systems. Its most ideal use is as a counter and frequency divider, and it is capable of dividing a signal from 2 to 8192 and rotating high speed devices. Its simple modular-based configuration, and 19-pin dual in-line configuration make it applicable for computing and controlling systems. The device can also be used as a logic converter, working as a single-bit word generator that can be used to generate pulse-width modulated signals.

The working principle of the SN74LS697N is quite simple. The internal RC oscillator is triggered by an external signal or by the clock and reset inputs. The oscillator then divides the input frequency by a value from 2 to 8192. This is done by using a shift register that is connected to the RC oscillator. The register is filled with the required data and then the clock pulse is sent for shifting. This makes the data move to the next stage of the shift register which generates the output. This output is divided by the previous stage logic and the result is the final output of the SN74LS697N.

In conclusion, the SN74LS697N is a versatile IC which is capable of providing a flexible and programmable solution for counting and dividing signals. Its efficient structure and simple working principle makes it the perfect choice of IC for application in computing and controlling systems.

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