ZHCSKI5D November 2019 – December 2021 SN74HCS74
PRODUCTION DATA
Toggle switches are typically large, mechanically complex and relatively expensive. It is desirable to use a momentary switch instead because they are small, mechanically simple and low cost. Some systems require a toggle switch's functionality but are space or cost constrained and must use a momentary switch instead. The SN74HCS74 has integrated Schmitt-trigger inputs that eliminate the need for a second IC for signal conditioning, reducing the required board space. This makes the SN74HCS74 an ideal device for converting a momentary switch into a toggle switch.
If the data input (D) of the SN74HCS74 is tied to the inverted output ( Q), then each clock pulse will cause the value at the output (Q) to toggle. The momentary switch can be debounced and directly connected to the clock input (CLK) to toggle the output.