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54LS42DMQBFAIRCHILDN/a25avaiDecimal Decoders
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DM74LS453N ,7 V, quad 4:1 multiplexerGeneral Description The quad 4:1 Mux selects one of four inputs, co through C3, specified by tw ..
DM74LS461N ,Octal CounterFeatures/BenefitsYprevious value regardless of clock transitions. The INCRE- Octal counter for micr ..
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DS2406X ,Dual Addressable Switch Plus 1-kbit MemoryFEATURES PIN ASSIGNMENTTO-92 6-PIN TSOC PACKAGE Open drain PIO pins are controlled and theirlogic ..
DS2407 ,Dual Addressable Switch Plus 1 kbit MemoryPIN DESCRIPTION16.3k bits/sTO-92 TSOC Low cost TO-92 or 6-pin TSOC surfacePin 1 Ground Groundmount ..
DS2408 ,1-Wire 8-Channel Addressable SwitchFEATURES PIN CONFIGURATION  Control Eight Independent I/O Port Pins from a Single Micro Port Pin o ..
DS2408 ,1-Wire 8-Channel Addressable Switch DS2408 1-Wire 8-Channel Addressable Switch BENEFITS AND
DS2408S+ ,1-Wire 8-Channel Addressable SwitchFEATURES PIN CONFIGURATION  Control Eight Independent I/O Port Pins from a Single Micro Port Pin o ..
DS2409P+ ,MicroLAN CouplerPIN DESCRIPTIONcontrol outputPin 1 GND Communicates at 16.3kbits per secondPin 2 1-Wire in Unique ..


54LS42DMQB-DM74LS42M-DM74LS42N
Decimal Decoders
TL/F/6365
54LS42/DM54LS42/DM74LS42
BCD/Decimal
Decoders
June 1989
54LS42/DM54LS42/DM74LS42 BCD/Decimal Decoders
General Description
These BCD-to-decimal decoders consistof eight inverters
andten, four-input NAND gates. The invertersare connect-in pairsto make BCD input data availablefor decodingthe NAND gates.Full decodingof input logic ensures
thatall outputs remainoffforall invalid (10–15) input condi-
tions.
Features Diode clamped inputs Alsofor applicationsas 4-line-to-16-line decoders;3-
line-to-8-line decodersAll outputsare highfor invalid input conditions Alternate Military/Aerospace device (54LS42)is avail-
able. Contacta National Semiconductor Sales Office/
Distributorfor specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6365–1
Order Number 54LS42DMQB, 54LS42FMQB,
DM54LS42J,DM54LS42W, DM74LS42M orDM74LS42N
See NSPackage Number J16A, M16A, N16Eor W16A
Function Table
No. BCD Inputs Decimal OutputsCBA 0123456789 LLLLL HHHHHHHHH LLL HHLH HHHHHHH LLHLHHL HHHHHHH LL HHHHHLH HHHHH LHLLH HHHL HHHHH LHL HHHHHHLH HHH LH HLHHHHH HLHHH L HHHHHHHHHHLHH HLLLH HHHHHHHLH HLL HHHHHHHHHHL HLHLH HHHHHHHHHN HL HHHHHHHHHHHHV HHLL HHHHHHHHHHA HHLH HHHHHHHHHHL HHHLH HHHHHHHHHI HHHHHHHHHHHHHHDeHigh LeveleLow Level
Logic Diagram
TL/F/6365–2
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
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