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MM74HC85N Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MM74HC85N Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 6 page  TLF5205 November 1995 MM54HC85MM74HC85 4-Bit Magnitude Comparator General Description The MM54HC85MM74HC85 is a 4-bit magnitude compara- tor that utilizes advanced silicon-gate CMOS technology It is designed for high speed comparison of two four bit words This circuit has eight comparison inputs 4 for each word three cascade inputs (AkB AlB AeB) and three deci- sion outputs (AkB AlB AeB) The result of a comparison is indicated by a high level on one of the decision outputs Thus it may be determined whether one word is ‘‘greater than’’ ‘‘less than’’ or ‘‘equal to’’ the other word By con- necting the outputs of the least significant stage to the cas- cade inputs of the next stage words of greater than four bits can be compared In addition the least significant stage must have a high level applied to the AeB input and a low level to the AkB and AlB inputs The comparator’s outputs can drive 10 low power Schottky TTL (LS-TTL) equivalent loads and is functionally and pin equivalent to the 54LS8574LS85 All inputs are protected from damage due to static discharge by diodes to VCC and ground Features Y Typical propagation delay 27 ns Y Wide operating voltage range 2 – 6V Y Low input current 1 mA maximum Y Low quiescent current 80 mA maximum (74HC Series) Y Output drive capability 10 LS-TTL loads Connection Diagram Dual-In-Line Package TLF5205 – 1 Order Number MM54HC85 or MM74HC85 Truth Table Comparing Cascading Outputs Inputs Inputs A3 B3 A2 B2 A1 B1 A0 B0 A l BA k BA e BA l BA k BA e B A3 l B3 X X X X X X H L L A3 k B3 X X X X X X L H L A3 e B3 A2 l B2 X X X X X H L L A3 e B3 A2 k B2 X X X X X L H L A3 e B3 A2 e B2 A1 l B1 X X X X H L L A3 e B3 A2 e B2 A1 k B1 X X X X L H L A3 e B3 A2 e B2 A1 e B1 A0 l B0 X X X H L L A3 e B3 A2 e B2 A1 e B1 A0 k B0 X X X L H L A3 e B3 A2 e B2 A1 e B1 A0 e B0 H L L H L L A3 e B3 A2 e B2 A1 e B1 A0 e B0 L H L L H L A3 e B3 A2 e B2 A1 e B1 A0 e B0 X X HL LH A3 e B3 A2 e B2 A1 e B1 A0 e B0 H H LL LL A3 e B3 A2 e B2 A1 e B1 A0 e B0 L L LH HL C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
Similar Part No. - MM74HC85N |
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Similar Description - MM74HC85N |
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