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DM74LS85N Datenblatt(PDF) 1 Page - National Semiconductor (TI) |
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DM74LS85N Datenblatt(HTML) 1 Page - National Semiconductor (TI) |
1 / 8 page TLF6379 June 1989 54LS85DM54LS85DM74LS85 4-Bit Magnitude Comparators General Description These 4-bit magnitude comparators perform comparison of straight binary or BCD codes Three fully-decoded decisions about two 4-bit words (A B) are made and are externally available at three outputs These devices are fully expand- able to any number of bits without external gates Words of greater length may be compared by connecting compara- tors in cascade The A l B A k B and A e B outputs of a stage handling less-significant bits are connected to the cor- responding inputs of the next stage handling more-signifi- cant bits The stage handling the least-significant bits must have a high-level voltage applied to the A e B input The cascading path is implemented with only a two-gate-level delay to reduce overall comparison times for long words Features Y Typical power dissipation 52 mW Y Typical delay (4-bit words) 24 ns Y Alternate MilitaryAerospace device (54LS85) is avail- able Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package TLF6379 – 1 Order Number 54LS85DMQB 54LS85FMQB 54LS85LMQB DM54LS85J DM54LS85W DM74LS85M or DM74LS85N See NS Package Number E20A J16A M16A N16E or W16A Function 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 L LHL LH 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 H e High Level L e Low Level X e Don’t Care C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
Ähnliche Teilenummer - DM74LS85N |
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Ähnliche Beschreibung - DM74LS85N |
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