Programming instructions

74xx
 National Instruments Corporation 6-17 Multisim Component Reference Guide
6.4.34 74xx148 (8-to-3 Priority Enc)
This TTL encoder features priority decoding of the inputs to ensure that only the highest-
order data line is encoded. It encodes eight data lines to three-line (4-2-1) binary (octal).
8-line to 3-line priority encoder truth table:
6.4.35 74xx15 (3 3-Input AND)
Logic function:
AND gate truth table:
6.4.36 74xx150 (1-of-16 Data Sel/MUX)
This device can select one of sixteen data sources when a 4-bit binary number is applied to the
inputs. It is equipped with one enable input and a complementary output.
INPUTS OUTPUTS
EI01234567A2A1A0GSEO
1XXXXXXXX11111
01111111111110
0XXXXXXX000001
0XXXXXX0100101
0XXXXX01101001
0XXXX011101101
0XXX0111110001
0XX01111110101
0X011111111001
00111111111101
Y = ABC
ABCY
1111
0XX0
X0X0
XX00
ComponentRef.book Page 17 Thursday, December 7, 2006 10:12 AM