555定时器逻辑功能及其应用的探讨

©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(,101601):5G555,TTL555,5G555,:555;:TN79+1:A:1672-7169(2005)03-0101-04555(1),,,55555G555(TTL)CC7555(CMOS),5G55515G55515G5551.15555G555R2SC1C2,R2ST,1)35k,C1C2VR1VR2(1),,VCO(0101F),1VCO,VR1=23VCCVR1=13VCCVCO,VR1=VCOVR1=VCO2)C1C2C1C2U+U-,1;U+U-,0C1(+)VR1,(-)TH,RVTHVR1VR1VTH,R1;VR1VTH,R0C2(+),(-)VR2,SVTRVR2VTRVR2,S1;VTRVR2,S01012320059::(1980-),,,,:2005206209©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.)R2SG1G2R2SRSC1C2,QOUT,QTŠRD0(),Vo=0,,,ŠRD4)TT,TDD,Q=0(Q=1),T,D0;Q=1(Q=0),T,D1,DOUT5)G3,25551.25555K,A1A223VCC13VCCA1A2RS623VCC,,3,T;213VCC,,3,4,4,V0=0;45,23VCC,5,,50101F,,,35551.2.1,5G555VCO,,5G555225G555VTHVTRŠRDR(C1)S(C2)OUTTdVR1VR1VR1dVR2VR2VR20111d110d0110101.2.2,5G555VCO,5G555335G555VTHVTRŠRDOUTTdd0023VCC13VCC1123VCC13VCC123VCC13VCC002012320059©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(3)555UI1(TH)UI2(TR),,,,,,45552.2,,:1),,,,2),UR1UR2,2.32.3.11)UI13VCC,UC1=1UC2=0,Q=1Q=0,UO=UOH2)13VCCUI23VCC,UC1=1UC2=1,RS,UO=UOH3)UI23VCC,UC1=0UC2=1,Q=0ŠQ=1,UOUOHUOL,UO=0UI23VCC,UT+=23VCC4)UI,2.3.21)UI,13VCCUI23VCC,UC1=1UC2=1RS,Q=0Q=1,UO=UOL2)UI13VCC,UC1=1UC2=0,Q=1Q=0,UOUOLUOHUI13VCC,UT-=13VCC2.3.3UT=UT+-UT-=13VCC2.3.4(4),3013:555©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:,5(a):,,UT,5(b),,:UT+,5(c),,UT+7:[1].[M].:,1998.[2].[M]..:,1993.[3].[M].:,1995.[4],.[M].:,1996.Adiscussionaboutthelogicfunctionandapplicationsof555TimerJIANGJing(NorthChinaInstituteofScience&Technology,YanjiaoBeijing2East101601)Abstract:Taking5G555forinstanceinthispaper,thecircuitstructureofTTL555Timeranditslogicalfunctionalityareana2lyzed.Furthermore,a5G555TimerisusedtoconstructaSchmittTriggerandtheapplicationsarepresentedinwaveformtransformation,pulseregulationandamplitudeidentification.KeyWords:555Timer;SchmittTrigger4012320059