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1、TL/F/6539DM54123/DM74123 Dual Retriggerable One-Shot with Clear and Complementary OutputsMarch 1993DM54123/DM74123 Dual Retriggerable One-Shot with Clear and Complementary OutputsGeneral Description The 123 is a dual retriggerable monostable multivibrator capable of generating output pulses from a f
2、ew nano-sec- onds to extremely long duration up to 100% duty cycle. Each device has three inputs permitting the choice of either leading-edge or trailing edge triggering. Pin (A) is an active- low transition trigger input and pin (B) is an active-high tran- sition trigger input. A low at the clear (
3、CLR) input terminates the output pulse: which also inhibits triggering. An internal connection from CLR to the input gate makes it possible to trigger the circuit by a positive-going signal on CLR as shown in the truth table. To obtain the best and trouble free operation from this de- vice please re
4、ad the operating rules as well as the NSC oneshot application notes carefully and observe recom- mendations.FeaturesYDC triggered from active-high transition or active-low transition inputsYRetriggerable to 100% duty cycleYDirect reset terminates output pulseYCompensated for VCCand temperature varia
5、tionsYDTL, TTL compatibleYInput clamp diodesFunctional Description The basic output pulse width is determined by selection of an external resistor (RX) and capacitor (CX). Once triggered, the basic pulse width may be extended by retriggering the gated active-low transition or active-high transition
6、inputs or be reduced by use of the active-low transition clear input. Retriggering to 100% duty cycle is possible by application of an input pulse train whose cycle time is shorter than the output cycle time such that a continuous HIGH logic state is maintained at the Q output.Connection DiagramDual
7、-In-Line PackageTL/F/65391 Order Number DM54123J-MIL, DM54123W-MIL or DM74123N See NS Package Number J16A, N16A or W16ATriggering Truth TableInputsResponse ABCLRXXLNo Trigger KLXNo Trigger KHHTriggerHLXNo Trigger LLHTrigger LHLTriggerHeHIGH Voltage Level LeLOW Voltage Level XeImmaterialC1995 Nationa
8、l Semiconductor CorporationRRD-B30M105/Printed in U. S. A.Absolute Maximum Ratings(Note) If Military/Aerospace specified devices are required, pleasecontacttheNationalSemiconductorSales Office/Distributors for availability and specifications. Supply Voltage7V Input Voltage5.5V Operating Free Air Tem
9、perature Range DM54b55C toa100C DM740C toa70CStorage Temperatureb65C toa150CNote:The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaran- teed. The device should not be operated at these limits. The parametric values defined in the Electrical Characterist
10、ics table are not guaranteed at the absolute maximum ratings. The Recommended Operating Conditions table will define the conditions for actual device operation.Recommended Operating ConditionsSymbolParameterDM54123DM74123Units MinNomMaxMinNomMaxVCCSupply Voltage4.555.54.7555.25VVIHHigh Level Input V
11、oltage22VVILLow Level Input Voltage0.80.8VIOHHigh Level Output Currentb0.8b0.8mAIOLLow Level Output Current1616mAtWPulse WidthA or B High40 (Note 5)A or B Low40nsClear Low40TWQMinimum Width ofA or B8065ns(Min)Pulse at Q (Note 5)REXTExternal Timing Resistor550kXCEXTExternal Timing CapacitanceNo Restr
12、ictionmFCWIREWiring Capacitance50pFat REXT/CEXTTerminal (Note 5)TAFree Air Operating Temperatureb55125070CElectrical Characteristics over recommended operating free air temperature range (unless otherwise noted)SymbolParameterConditionsMinTypMaxUnits(Note 1)VIInput Clamp VoltageVCCeMin, IIe b12 mAb1
13、.5VVOHHigh Level OutputVCCeMin, IOHeMaxDM542.43.4VVoltageVILeMax, VIHeMinDM742.5VOLLow Level OutputVCCeMin, IOLeMax0.20.4VVoltageVIHeMin, VILeMaxIIInput CurrentMaxVCCeMax, VIe5.5V1mAInput VoltageIIHHigh Level InputVCCeMaxData40mACurrentVIe2.4VClear80IILLow Level Input CurrentVCCeMax, VIe0.4VClearb3.
14、2mA Datab1.6IOSShort CircuitVCCeMaxDM54b10b40mAOutput Current(Note 2)DM74b10b40ICCSupply CurrentVCCeMax (Notes 3 and 4)4666mANote 1: All typicals are at VCCe5V, TAe25C.Note 2: Not more than one output should be shorted at a time.Note 3: Quiescent ICCis measured (after clearing) with 2.4V applied to
15、all clear and A inputs, B inputs grounded, all outputs open,CEXTe0.02 mF, and REXTe 25 KX.Note 4: ICCis measured in the triggered state with 2.4V applied to all clear and B inputs, A inputs grounded, all outputs open, CEXTe0.02 mF, and REXTe25 kX.Note 5: TAe25C and VCCe5V.2Switching Characteristicsa
16、t VCCe5V and TAe25CDM54123DM74123SymbolParameterFrom (Input)CLe15 pF, RLe400XCLe15 pF, RLe400XUnitsTo (Output)CEXTe0 pF, REXTe5 kXCEXTe1000 pF, REXTe10 KXMinMaxMinMaxtPLHPropagation Delay TimeA to Q3333nsLow to High Level OutputtPLHPropagation Delay TimeB to Q2828nsLow to High Level OutputtPHLPropagation Delay TimeA to Q4040nsHigh to Low Level OutputtPHLPropagation Delay TimeB to Q3636nsHigh to Low Level OutputtPLHPropagation Delay TimeClear to Q4040nsLow to Hig
