DM74LS21中文资料

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TL F 635654LS21 DM54LS21 DM74LS21 Dual 4-Input AND GatesJune198954LS21 DM54LS21 DM74LS21Dual4-Input AND Gates General DescriptionThis device contains two independent gates each of whichperforms the logic AND functionFeaturesY Alternate Military Aerospace device(54LS21)is avail-able Contact a National Semiconductor Sales OfficeDistributor for specificationsConnection DiagramDual-In-Line PackageTL F 6356–1Order Number54LS21DMQB 54LS21FMQB 54LS21LMQBDM54LS21J DM54LS21W DM74LS21M or DM74LS21NSee NS Package Number E20A J14A M14A N14A or W14BFunction TableY e ABCDInputs OutputA B C D YX X X L LX X L X LX L X X LL X X X LH H H H HH e High Logic LevelL e Low Logic LevelX e Either Low or High Logic LevelC1995National Semiconductor Corporation RRD-B30M105 Printed in U S AAbsolute Maximum Ratings(Note)If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage7V Input Voltage7V Operating Free Air Temperature RangeDM54LS and54LS b55 C to a125 C DM74LS0 C to a70 C Storage Temperature Range b65 C to a150 C Note 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 Characteristics’’table are not guaranteed at the absolute maximum ratings The‘‘Recommended Operating Conditions’’table will define the conditions for actual device operationRecommended Operating ConditionsSymbol ParameterDM54LS21DM74LS21Units Min Nom Max Min Nom MaxV CC Supply Voltage4 555 54 7555 25V V IH High Level Input Voltage22V V IL Low Level Input Voltage0 70 8V I OH High Level Output Current b0 4b0 4mA I OL Low Level Output Current48mA T A Free Air Operating Temperature b55125070 C Electrical Characteristics over recommended operating free air temperature range(unless otherwise noted)Symbol Parameter Conditions MinTypMax Units (Note1)V I Input Clamp Voltage V CC e Min I I e b18mA b1 5V V OH High Level Output V CC e Min I OH e Max DM542 53 4V Voltage V IH e Min DM742 73 4V OL Low Level Output V CC e Min I OL e Max DM540 250 4 Voltage V IL e Max DM740 350 5VI OL e4mA V CC e Min DM740 250 4I I Input Current Max V CC e Max V I e7V0 1mAInput VoltageI IH High Level Input Current V CC e Max V I e2 7V20m A I IL Low Level Input Current V CC e Max V I e0 4V b0 36mAI OS Short Circuit V CC e Max DM54b20b100mA Output Current(Note2)DM74b20b100I CCH Supply Current with V CC e Max1 22 4mAOutputs HighI CCL Supply Current with V CC e Max2 24 4mAOutputs LowSwitching Characteristics at V CC e5V and T A e25 C(See Section1for Test Waveforms and Output Load)R L e2k XSymbol Parameter C L e15pF C L e50pF UnitsMin Max Min Maxt PLH Propagation Delay Time413618ns Low to High Level Outputt PHL Propagation Delay Time311518ns High to Low Level OutputNote1 All typicals are at V CC e5V T A e25 CNote2 Not more than one output should be shorted at a time and the duration should not exceed one second23Physical Dimensions inches(millimeters)Ceramic Leadless Chip Carrier Package(E)Order Number54LS20LMQBNS Package Number E20A14-Lead Ceramic Dual-In-Line Package(J)Order Number54LS20DMQB or DM54LS21JNS Package Number J14A4Physical Dimensions inches(millimeters)(Continued)14-Lead Small Outline Molded Package(M)Order Number DM74LS21MNS Package Number M14A14-Lead Molded Dual-In-Line Package(N)Order Number DM74LS21NNS Package Number N14A554L S 21 D M 54L S 21 D M 74L S 21D u a l 4-I n p u t A N D G a t e sPhysical Dimensions inches (millimeters)(Continued)14-Lead Ceramic Flat Package (W)Order Number 54LS21FMQB or DM54LS21WNS Package Number W14BLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or 2 A critical component is any component of a life systems which (a)are intended for surgical implant support device or system whose failure to perform can into the body or (b)support or sustain life and whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system or to affect its safety or with instructions for use provided in the labeling can effectivenessbe reasonably expected to result in a significant injury to the userNational Semiconductor National Semiconductor National Semiconductor National Semiconductor CorporationEuropeHong Kong LtdJapan Ltd1111West Bardin RoadFax (a 49)0-180-530858613th Floor Straight Block Tel 81-043-299-2309。