Programming instructions

74xx
 National Instruments Corporation 6-79 Multisim Component Reference Guide
6.4.13574xx51 (AND-OR-INVERTER)
AND-OR INVERTER gate truth table:
6.4.13674xx521 (8-Bit Identity Comparitor)
The 74F521 is an expandable 8-bit comparator. It compares two words of up to eight bits each
and provides a LOW output when the two words match bit for bit. The expansion input IA=B
also serves as an active LOW enable input.
ABCDY
0XX01
X00X1
0X0X1
X0X01
11XX0
XX110
ComponentRef.book Page 79 Thursday, December 7, 2006 10:12 AM