Programming instructions

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Multisim Component Reference Guide 6-42 ni.com
6.4.74 74xx24 (Dual 4-input NAND Schmitt)
Each circuit in this device functions as a NAND gate or inverter. Due to the Schmitt action,
there are different input threshold levels for positive-going and negative-going signals.
6.4.75 74xx240 (Octal BUFFER w/3-state Out)
This device has high fan-out, improved fan-in, and 400-mV noise margin.
Octal BUFFER gate truth table:
6.4.76 74xx241 (Octal BUFFER w/3-state Out)
This device has high fan-out, improved fan-in, and 400-mV noise margin.
Octal BUFFER gate truth table:
6.4.77 74xx244 (Octal BUFFER w/3-state Out)
This device has high fan-out, improved fan-in, and 400-mV noise margin.
G AY
1XZ
001
010
Z = High impedance (off)
INPUTS OUTPUTS
G
A1 A2 A3 A4 Y1 Y2 Y3 Y4
1XXXXZZZZ
0XXXXA1A2A3A4
Z = High impedance (off)
A1, A2... = The level of the respective input
ComponentRef.book Page 42 Thursday, December 7, 2006 10:12 AM