Programming instructions

74xx
 National Instruments Corporation 6-57 Multisim Component Reference Guide
Multiplexer truth table:
6.4.99 74xx30 (8-In NAND)
Logic function:
8-input NAND gate truth table:
6.4.10074xx32 (Quad 2-In OR)
This device contains four independent 2-input OR gates.
Logic function:
WORD
SELECT
CLKQAQBQCQD
0 Ø a1 b1 c1 d1
1 Ø a2 b2 c2 d2
X Ø QA0 QB0 QC0 QD0
‚ = transition from high to low
a1, a2, etc. = the level of steady state input at A1, A2, etc.
QA0, QB0, etc. = the level of QA, QB, etc.entered on the most recent negative
transition of the clock input
Y = ABCDEFGH
INPUTS A THROUGH H Y
All inputs 1 0
One or more inputs 0 1
Y = A+B
ComponentRef.book Page 57 Thursday, December 7, 2006 10:12 AM