Programming instructions

TTL
Multisim Component Reference Guide 6-2 ni.com
6.3 Low-Power Schottky TTL
The low-power Schottky TTL (the 74LS series) is lower in power and slower in speed than
the 74S series. It uses the Schottky-clamped transistor, but with larger resistor values than the
74S series. The larger resistor values reduce the power requirements of the circuit, but
increase the switching times.
A NAND gate in the 74LS series typically has an average propagation delay of 9.5 ns and an
average power dissipation of 2 mW.
6.4 74xx
6.4.1 74xx00 (Quad 2-In NAND)
This device contains four independent 2-input NAND gates.
Logic function:
NAND gate truth table:
ABY
001
101
011
110
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