54LS85 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.
54LS85 Maximum Ratings
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range
DM54LS and 54LS -55 to +125
DM74LS 0 to +70
Storage Temperature Range -65 to +150
54LS85 Features
Typical power dissipation 52 mW
Typical delay (4-bit words) 24 ns
Alternate Military/Aerospace device (54LS85) is available.Contact a National Semiconductor Sales Office/Distributor for specifications.
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