Automotive D-type flip-flops can convert a momentary switch to a toggle switch

Texas Instruments SN74HCS72-Q1 Automotive D-type Flip-Flops comprise Schmitt-triggers, providing for noisy or slow input signals. A low level at the preset (PRE) input fixes the output high. A low level at the clear (CLR) input resets the output low. Preset and clear functions are asynchronous and are not reliant on the levels of the other inputs.

When PRE and CLR are inactive (high), data at the data (D) input satisfying the setup time demands are transferred to the outputs (Q, Q) on the negative-going edge of the clock (CLK) pulse. Following the hold-time interval, data at the data (D) input can be altered without modifying the levels at the outputs (Q, Q).

Typical applications include converting a momentary switch to a toggle switch; input slow edge-rate signals; operate in noisy environments; and enable CAN Controller Power with wake-up pattern.