数字电路教学课件：chapter3-2

1、Combinational logic circuitsChapter 3Circuits ParameterspVcc, power supply voltage(TTL=5v)pIcc, power supply currentnICCH, ICCL pVOL(*), VOH(*) , IOL(*), IOH(*)pVIL(TTL=0.8v), VIH(TTL=2v), IIL(*), IIH(*)ptpLH, tpHL (propagation)pFan-out (TTL=10pcs)caused by the transient behavior of signal path that

2、 have different delaysHazard Static hazardStatic hazardZPXYXYZYG1G2G3G4YStatic hazardZPXYXYZYG1G2G3G4YYXYZYPt0t1t2t1t3glitchAt time t0, y went from 1 to 0At time t1, y went from 0 to 1;At time t1, zy went from 0 to 1;At time t2, xy went from 0 to 1;nBetween time t1 to t2, neither inputs of G4 was a

3、1. Accounting for the delay t through G4 the momentary 0 time is from t2(t1+t) to t3(t2+t).YFind the potential for static hazardFind the potential for static hazardFind the potential for static hazardFind the potential for static hazard000111100101236745XYZMSBLSB111 1Find the potential for static ha

4、zard00011110ABCD000111100 4 12 8 1 5 13 9 3 7 15 11 2 6 14 10 MSB=A ; LSB=D000 000pNo static hazardpNo PI can be generated to bridge the two EPIsDynamic hazardpThere is a digital augur can foresee blood type for baby according to parents blood type.nIf parents have same blood type , the baby is eith

5、er O type or to be inherit his parents.nIf one parent is A type, the other is O type, the baby is either A type or O type.nIf one parent is B type, the other is O type, the baby is either B type or O type.nIf one parent is AB type, the other is O type, the baby is either A type or B type.nIf one par

6、ent is AB type, the other is either A type or B type, the baby would not be O type.nIf one parent is A type, the other is B type, the baby is neither O type nor AB type.pDesign a combinational circuit used to judge the compatibility of the blood donor and the beneficiary.ABABOdonorbeneficiaryAVVBVVABVVVVOV00011110ABCD000111100 4 12 8 1