DM7485

* Typical power dissipation 275 mW
* Typical delay (4-bit words) 23 ns
* Alternate Military/Aerospace device (5485) is available.
   Contact a National Semiconductor Sales Office/Distributor
   for specifications.

These  4-bit magnitude comparators DM7485 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 DM7485 are fully expandable to any number of bits without external gates. Words of greater length may be compared by connecting comparators in cascade. The A > B, A < B, and A  B outputs of a stage handling less-significant bits are connected to the corresponding inputs of the next stage handling more-significant bits. The stage handling the least-significant bits must have a high-level voltage applied to the A e B input. The cascading paths are implemented with only a two-gate-level delay to reduce overall comparison times for long words.