Programming instructions

74xx
National Instruments Corporation 6-49 Multisim Component Reference Guide
Data selector/multiplexer truth table:
6.4.84 74xx253 (Dual 4-to-1 Data Sel/MUX w/3-state Out)
This Schottky-clamped data selector/multiplexer contains inverters and drivers to supply fully
complementary on-chip, binary decoding data selection to the AND-OR gates.
Data selector/multiplexer truth table:
6.4.85 74xx257 (Quad 2-to-1 line Data Sel/MUX)
This device is designed to multiplex signals from 4-bit data sources to 4-output data lines in
bus-organized systems. Its 3-state outputs interface directly with the system bus.
ComponentRef.book Page 49 Thursday, December 7, 2006 10:12 AM