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74HC688 74HC521 8-Bit Magnitude Comparator or Equality Detector
Part Number IC_74HC688
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MM74HC688N / MC74HC521N 8bit Equality comparator

(for whatever reason this part actualy has two part numbers both with the same function)

This IC compares two 8 bit words and indicates if they are equal. Posible to cascade multiple chips to compare larger data patterns.

20pin Dip

Unit was pulled from working board.
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