The noise margin for TTL is 0.8 V.

More Questions from Integrated-Circuit Logic Families

• The data sheet for the 74 series of TTL ICs shows that Vcc has a range of 4.5 V to 5.5 V.
• The dc noise margins calculated using the proper values from a standard TTL data sheet are the worst-case margins. The typical dc noise margins are usually somewhat higher.
• The logic family with the highest maximum clock frequency is HS-TTL.
• ECL gates are noted for their high frequency capability and small output voltage swing.
• The upper transistor of a totem-pole output is OFF when the gate output is low.
• The major advantage of TTL logic circuits over CMOS is lower propagation delay.
• The principal advantage of MOS ICs over TTL ICs is their fast operating speed.
• Due to the extremely low power requirements of CMOS logic circuits, any number of CMOS and TTL gates can be interconnected.
• Most TTL gates use the totem-pole output arrangement.
• The output current capability for a HIGH output condition is called a source current.

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