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74LS240HITN/a1433avaiOctal 3-STATE Buffer/Line Driver/Line Receiver
74LS241N/a20avaiOctal 3-STATE Buffer/Line Driver/Line Receiver
DM54LS240JNSN/a78avaiOctal TRI-STATE Buffers/Line Drivers/Line Receivers


74LS240 ,Octal 3-STATE Buffer/Line Driver/Line ReceiverFeaturesYTypical power dissipation (enabled)YTRI-STATE outputs drive bus lines directlyInverting 13 ..
74LS241 ,Octal 3-STATE Buffer/Line Driver/Line ReceiverFeaturesYTypical power dissipation (enabled)YTRI-STATE outputs drive bus lines directlyInverting 13 ..
74LS244 ,Octal 3-STATE Buffer/Line Driver/Line ReceiverFeaturesThese buffers/line drivers are designed to improve both the 3-STATE outputs drive bus line ..
74LS245 ,3-STATE Octal Bus TransceiverFeaturesThese octal bus transceivers are designed for asynchro- Bi-Directional bus transceiver in ..
74LS247 ,8CD-to-Seven-Segment Decoders/Drivers(with 15V outputs)3SN74LS247LS247FUNCTION TABLEDECIMALINPUTS OUTPUTSOR OR BI/RBO BI/RBO NOTE NOTEFUNCTIONLT RBI D C B ..
74LS249 , BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS
78P2241-IGT , Transceiver
78P2344JAT-IGT , 4-port E3/DS3/STS-1 LIU with Jitter Attenuator
78P2344JAT-IGT , 4-port E3/DS3/STS-1 LIU with Jitter Attenuator
78P7200L-IGT , E3/DS3/STS-1 Transceiver
78Q2123 ,10/100 Fast Ethernet MicroPHYPin Description.......11 2.1 Legend...11 2.2 MII (Media Independent Interface) ....11 2.3 Control a ..
78Q2123/F ,10/100 Fast Ethernet MicroPHYapplications. The MDI isnegotiation and 10BASE-T signal receptionconnected to the line media via du ..


74LS240-74LS241-DM54LS240J
Octal 3-STATE Buffer/Line Driver/Line Receiver
TL/F/6411
DM54LS240/DM74LS240,
DM54LS241/DM74LS241
Octal
TRI-STATE
Buffers/Line
Drivers/Line
Receivers
April 1992
DM54LS240/DM74LS240,
DM54LS241/DM74LS241
Octal TRI-STATEÉ Buffers/Line Drivers/Line Receivers
General Description
These buffers/line driversare designedto improve boththe
performanceandPC board densityof TRI-STATE buffers/
drivers employedas memory-address drivers, clock drivers,
and bus-oriented transmitters/receivers. Featuring 400mV hysteresisat eachlow current PNP dataline input, they
provide improved noise rejection and high fanout outputs
andcanbe usedto drive terminated lines downto 133X.
Features TRI-STATE outputs drivebus lines directly PNP inputs reduceDC loadingonbus lines Hysteresisat data inputs improves noise margins TypicalIOL (sink current)
54LS 12mA
74LS 24mA TypicalIOH (source current)
54LS b12mA
74LS b15mA Typical propagation delay times
Inverting 10.5ns
Noninverting 12ns Typical enable/disable time18ns Typical power dissipation (enabled)
Inverting 130 mW
Noninverting 135 mW
Connection Diagrams
Dual-In-Line Package
TL/F/6411–1
Dual-In-Line Package
TL/F/6411–2
Order Number DM54LS240J,
DM54LS240W, DM54LS240E,
DM74LS240WMor DM74LS240N
SeeNS Package Number E20A, J20A,
M20B, N20AorW20A
Order NumberDM54LS241J,
DM54LS241W, DM54LS241E,
DM74LS241WMor DM74LS241N
SeeNS Package Number E20A, J20A,
M20B, N20Aor W20A
Function Tables
LS240
Inputs Output AY H L Z
LS241
Inputs Outputs 1A 2A 1Y 2Y L X L H X H X X Z X L L X H H X X ZeLow Logic LeveleHigh Logic Levele Either LoworHigh Logic Levele HighImpedance
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
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