54LS85/DM54LS85/DM74LS85
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 expandable
to any number of bits without external gates. Words of
greater length may be compared by connecting comparators
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 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 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 Military/Aerospace device (54LS85) is available.
Contact a National Semiconductor Sales Office/
Distributor for specifications.