74174

74174

Hex D flip-flop

Used as page register for memory paging in ZX Spectrum 128K

Pinout

CLEAR 1Q 1D 2D 2Q 3D 3Q GND

1 °       16 2         15 3         14 4         13 5         12 6         11 7         10 8         9

VCC 6Q 6D 5D 5Q 4D 4Q CLK

Function table
(each flip-flop)

Inputs			Output
CLEAR	CLK	xD	xQ
L	X	X	L
H	↑	H	H
H	↑	L	L
H	L	X	xQO

H = high level (1) steady state
L = low level (0) steady state
X = irrelevant
↑ = transition from L to H
xQ_O = the level of xQ before the indicated steady-state input conditions were established