TL/F/6530
5485/DM5485/DM7485
4-Bit
Magnitude
Comparators
June 1989
5485/DM5485/DM7485
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 paths are implemented with only a two-gate-level
delay to reduce overall comparison times for long words.
Features
Y
Typical power dissipation 275 mW
Y
Typical delay (4-bit words) 23 ns
Y
Alternate Military/Aerospace device (5485) is available.
Contact a National Semiconductor Sales Office/Distrib-
utor for specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6530–1
Order Number 5485DMQB, 5485FMQB, DM5485J, DM5485W or DM7485N
See NS Package Number J16A, N16E or W16A
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.