74LS85 – 4-bit Magnitude Comparator [Original]

Description of product

74LS85, 4-bit Magnitude Comparator [Original]

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 > 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 leastsignificant bits must have a high-level voltage applied to the A = B input. The cascading path is implemented with only a two-gate-level delay to reduce overall comparison times for long words.
Features & Specifications
  • Performs Comparison of Binary or BCD Codes
  • Can Compare Greater Than, Less Than and Equal
  • Words of Greater Length Can be Compared by Cascading
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

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