DM74LS253N ,TRI-STATE Data Selectors/Multiplexers54LS253/DM54LS253/DM74LS253TRI-STATEDataSelectors/MultiplexersJune198954LS253/DM54LS253/DM74LS253TR ..
DM74LS253N ,TRI-STATE Data Selectors/MultiplexersFeaturesEach of these Schottky-clamped data selectors/multiplex- ■ 3-STATE version of DM74LS153 wit ..
DM74LS256N ,Dual 4-Bit Addressable LatchFeaturesYWhen the Enable (E) is HIGH and the Clear input (CL)isSerial-to-parallel capabilityLOW, al ..
DM74LS257BM ,3-STATE Quad 2-Data Selectors/Multiplexers54LS257A/DM54LS257B/DM74LS257B,54LS258A/DM54LS258B/DM74LS258BTRI-STATEQuad2-DataSelectors/Multiplex ..
DM74LS257BMX , 3-STATE Quad 2-Data Selector/MultiplexerFeaturesdata lines of bus-organized systems. With all but one of thecommon outputs disabled (at a h ..
DM74LS257BN ,TRI-STATE Quad 2-Data Selectors/MultiplexersGeneral Descriptionisters for data retention throughout the system.These Schottky-clamped high-perf ..
DS21Q59LN+ ,E1 Quad TransceiverPIN DESCRIPTION.8 4.1 PIN FUNCTION DESCRIPTIONS...12 5.
DS21S07A ,SCSI TerminatorGENERAL DESCRIPTION PIN CONFIGURATIONS Fast SCSI and Ultra SCSI require the use of active terminati ..
DS21S07AE ,SCSI TerminatorGENERAL DESCRIPTION PIN CONFIGURATIONS Fast SCSI and Ultra SCSI require the use of active terminati ..
DS21S07AS ,SCSI TerminatorFEATURES Fully Compliant with SCSI-1, Fast SCSI, and Ultra SCSI Backward Compatible to the DS2107 ..
DS21S07AS/TR , SCSI Terminator
DS21T05 ,SCSI TerminatorFUNCTIONAL DESCRIPTIONThe DS21T05 consists of a bandgap reference, buffer amplifier, and nine termi ..
54LS253DMQB-DM74LS253N
TRI-STATE Data Selectors/Multiplexers
TL/F/6416
54LS253/DM54LS253/DM74LS253
TRI-STATE
Data
Selectors/Multiplexers
June 1989
54LS253/DM54LS253/DM74LS253
TRI-STATEÉ Data Selectors/Multiplexers
General Description
Eachof these Schottky-clamped data selectors/multiplex-
ers contains inverters and driversto supply fully comple-
mentary, on-chip, binary decoding data selectiontothe
AND-OR gates. Separate output control inputsare provided
for eachofthetwo four-line sections.
The TRI-STATE outputs can interface directly with data
linesofbus-organized systems. Withallbutoneofthe com-
mon outputs disabled(ata high impedance state),thelow
impedanceofthe single enabled outputwill drivethebus
linetoa highorlow logic level.
Features TRI-STATE versionof LS153 with same pinout Schottky-diode-clamped transistors Permit multiplexing from N-linestooneline Performs parallel-to-serial conversion Strobe/output control High fanout totem-pole outputs Typical propagation delay
Datato output 12ns
Selectto output21ns Typical power dissipation35 mW Alternate Military/Aerospace device (54LS253)is avail-
able. Contacta National Semiconductor Sales Office/
Distributorfor specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6416–1
Order Number 54LS253DMQB, 54LS253FMQB,
54LS253LMQB, DM54LS253J,DM54LS253W,
DM74LS253Mor DM74LS253N
SeeNS Package Number E20A, J16A,
M16A, N16Eor W16A
Function Table
Select Data Inputs Output OutputInputs Control A C0 C1 C2 C3 G Y XX X X H Z L X X X L L H X X X L H X L X X L L X H X X L H XX L X L L XX H X L H X X X L L L X X X H L H
AddressInputsAandBare common toboth sections.e HighLevel,Le LowLevel,X eDon’t Care,ZeHigh Impedance(off).
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
