74174: Difference between revisions
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Function table
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No edit summary Tags: Mobile edit Mobile web edit |
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Hex D flip-flop. | |||
It used as bank register in [[ZX Spectrum 128K]] for [[memory paging]]. | |||
====Pinout==== | ====Pinout==== | ||
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|} | |} | ||
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====Function table<br>(each flip-flop)==== | |||
{|class="wikitable" | |||
!colspan="3"|Inputs||Output | |||
|- | |||
!CLEAR||Clock||D||xQ | |||
|- | |||
|L||X||X||L | |||
|- | |||
|H||↑||L||L | |||
|- | |||
|H||↑||H||H | |||
|- | |||
|H||L||X||Q<sub>O</sub> | |||
|} | |||
H = high level (steady state)<br> | |||
L = low level (steady state)<br> | |||
X = irrelevant<br> | |||
↑ = transition from low to high level<br> | |||
xQ<sub>O</sub> = the level of xQ before the indicated steady-state input conditions were established | |||
Revision as of 15:57, 5 May 2021
Hex D flip-flop.
It used as bank register in ZX Spectrum 128K for memory paging.
Pinout
|
CLEAR [ |
1 ° 16 |
] VCC |
Function table
(each flip-flop)
| Inputs | Output | ||
|---|---|---|---|
| CLEAR | Clock | D | xQ |
| L | X | X | L |
| H | ↑ | L | L |
| H | ↑ | H | H |
| H | L | X | QO |
H = high level (steady state)
L = low level (steady state)
X = irrelevant
↑ = transition from low to high level
xQO = the level of xQ before the indicated steady-state input conditions were established