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MM54C85J
4-Bit Magnitude Comparator
TL/F/5886
MM54C85/MM74C85
4-Bit
Magnitude
Comparator
September 1989
MM54C85/MM74C85 4-Bit Magnitude Comparator
General Description
The MM54C85/MM74C85isa four-bit magnitude compara-
tor whichwill perform comparisonof straight binaryor BCD
codes. The circuit consistsof eight comparing inputs (A0,
A1,A2,A3,B0,B1,B2,B3), three cascading inputs(AlB,kBandAeB),and three outputs(AlB,AkBandeB). This device comparestwo four-bit words(AandB)
and determines whether they are ‘‘greater than,’’ ‘‘less
than,’’or ‘‘equalto’’ each otherbya high level onthe appro-
priate output.For words greater than four-bits, unitscanbe
cascadedby connectingthe outputs(AlB,AkB,andeB)ofthe least significant stagetothe cascade inputslB,AkBandAeB)ofthe next-significant stage.In
additionthe least significant stage must havea high level
voltage (VIN(1)) appliedtotheAeB inputandlow level
voltage (VIN(0)) appliedtoAlBandAkB inputs.
Features Wide supply voltage range 3.0Vto 15V Guaranteed noise margin 1.0V High noise immunity 0.4 VCC (typ.) Low power fanoutof2
TTL compatibility driving74L Expandableto‘N’ stages Applicableto binaryor BCD Low power pinout: 54L85/74L85
Logic Diagram
TL/F/5886–1
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
