These comparators perform an “equal to” comparison of
two 8-bit words with provision for expansion or external
enabling. The matching of the two 8-bit input plus a logic
LOW on the EN input produces the output A = B on the
74ALS521. The 74ALS521 has totem pole outputs for wire and cascading.
Switching specifications at 50 pF
Switching specifications guaranteed over full temperature and VCC range
Advanced oxide-isolated, ion-implanted Schottky TTL process
Functionally and pin for pin compatible with LS family counterpart
Improved output transient handling capability
20 pin DIP. Actual brand may vary from picture.