7474

The 7474 (variants 74LS74, 74HC74) is a 74-series logic IC with two independent D flip-flops.

Pinout

         .--\/--.
/1RST -> |01  14| -- +5V
   1D -> |02  13| <- /2RST
 1CLK -> |03  12| <- 2D
/1SET -> |04  11| <- 2CLK
   1Q <- |05  10| <- /2SET
  /1Q <- |06  09| -> 2Q
  Gnd -- |07  08| -> /2Q
         `------'

Signal descriptions

For each flip-flop:

Inputs				Outputs
/RST	/SET	CLK	D	Q	/Q
L	H	X		L	H
H	L			H	L
L				N
H		L	X	U
		↑	H	H	L
			L	L	H

L = low, H = high, ↑ = low to high, X = don't care, N = nonstable, U = unchanged.