74174
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74174
Hex D flip-flop
Used as page register for memory paging in ZX Spectrum 128K
Pinout
CLEAR |
1 ° 16 |
VCC |
Function table
(each flip-flop)
Inputs | Output | ||
---|---|---|---|
CLEAR | CLK | xD | xQ |
L | X | X | L |
H | ↑ | H | H |
H | ↑ | L | L |
H | L | X | QO |
H = high level (1) steady state
L = low level (0) steady state
X = irrelevant
↑ = transition from L to H
QO = the level of Q before the indicated steady-state input conditions were established