Programming instructions

74xx
 National Instruments Corporation 6-69 Multisim Component Reference Guide
6.4.12174xx395 (4-bit Cascadable Shift Reg w/3-state
Out)
This device is a 4-bit shift register with 3-state outputs. It features parallel-in and parallel out
registers.
4-bit shift register truth table:
6.4.12274xx40 (Dual 4-In NAND)
This device contains two independent 4-input NAND gate.
Logic function:
NAND gate truth table:
OC CLR LD/SHCLKSERABCDQAQBQCQDQD
0XX XXXXXXZZZZQD
10X XXXXXX00000
111 1 XXXXXNO CHANGE
1 1 1 Ø X A B C D QAQBQCQDQD
110 1 XXXXXNO CHANGE
110 Ø1XXXX1QAQBQCQC
110 Ø0XXXX0QAQBQCQC
Y = ABCD
INPUTS OUTPUT
ABCDY
11110
0XXX1
X0XX1
XX0X1
XXX01
ComponentRef.book Page 69 Thursday, December 7, 2006 10:12 AM