74174: Difference between revisions
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Function table
Tags: Mobile edit Mobile web edit |
Tags: Mobile edit Mobile web edit |
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| Line 43: | Line 43: | ||
!colspan=3|Inputs!!Output | !colspan=3|Inputs!!Output | ||
|- | |- | ||
!CLEAR||CLK||xD||xQ | |||
|- | |- | ||
|L||X||X||L | |L||X||X||L | ||
|- | |- | ||
|H|| | |H||↑||H||H | ||
|- | |- | ||
|H|| | |H||↑||L||L | ||
|- | |- | ||
|H||L||X||Q<sub>O</sub> | |H||L||X||Q<sub>O</sub> | ||
|} | |} | ||
</div> | </div> | ||
H = high level (1) steady state<br> | |||
L = low level (0) steady state<br> | |||
X = irrelevant<br> | |||
↑ = transition from L to H<br> | |||
Q<sub>O</sub> = the level of Q before the indicated steady-state input conditions were established | |||
[[Category:Hardware]] | [[Category:Hardware]] | ||
[[Category:Integrated Circuit]] | [[Category:Integrated Circuit]] | ||
Revision as of 08:49, 5 May 2021
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