The UT54ACS109 and the UT54ACTS109 are dual J-K positive triggered flip-flops. A low level at the preset or clear inputs sets or resets the outputs regardless of the other input levels. When preset and clear are inactive (high), data at the J and K input meeting the setup time requirements are transferred to the outputs on the positive-going edge of the clock pulse. Following the hold time interval, data at the J and K input can be changed without affecting the levels at the outputs. The flip-flops can perform as toggle flip-flops by grounding K and tying J high. They also can perform as D flip-flops if J and K are tied together.