HD74HCT74A Datasheet (Hitachi Semiconductor) - Dual D-type Positive Edge-triggered Flip Flops with Clear and Preset

HD74HCT74A, Dual D-type Positive Edge-triggered Flip Flops with Clear and Preset

The HD74HCT74A has independent data, preset, clear, and clock inputs Q and Q outputs in a 14 pin package.

The logic level present at the data input is transferred to the output during the positive going transition of the clock pulse.

Preset and clear are independent of the clock and accomplished by

HD74HCT74A Features

* VCC = 4.5 to 5.5 V operation

* Input terminal has protection diode Function Table Inputs PRE L H L H H H CLR H L L H H H CLK X X X ↑ ↑ L D X X X H L X Outputs Q H L H H L Q0

* 1 Q L H H

* 1 L H Q0 H : High level L : Low level X : Immaterial ↑ : Low to high transition Q0 :