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前
CLK
K
Q
Q
CLR
J
SN74LVC112A
dualnegative-边缘-triggeredj-kflip-flop
WITHCLEARANDPRESET
SCAS289L–JANUARY1993–REVISEDAUGUST2005
FUNCTIONTABLE
INPUTSOUTPUTS
PRECLRCLKJKQQ
LHXXXHL
HLXXXLH
LLXXXH
(1)
H
(1)
HH
↓
LLQ
0
Q
0
HH
↓
HLHL
HH
↓
LHLH
HH
↓
HHToggle
HHHXXQ
0
Q
0
(1)theoutputlevelsinthisconfigurationmaynotmeettheminimum
levelsforV
OH
.此外,thisconfigurationisnonstable;thatis,
itdoesnotpersistwheneitherPREorCLRreturnstoitsinactive
(高)水平的.
logicdiagram,eachflip-flop(positivelogic)
2