The use of transistors for the construction of logic gates depends upon their utility as fast switches. When the base-emitter diode is turned on enough to be driven into saturation, the collector voltage with respect to ground may be less than a volt and can be used as a logic 0 in the TTL logic family.

The use of transistors for the construction of logic gates depends upon their utility as fast switches. When the base-emitter diode is turned on enough to be driven into saturation, the collector voltage with respect to ground may be less than a volt and can be used as a logic 0 in the TTL logic family.

The use of transistors for the construction of logic gates depends upon their utility as fast switches. When the base-emitter diode is turned on enough to be driven into saturation, the collector voltage with respect to ground may be less than a volt and can be used as a logic 0 in the TTL logic family.

The use of transistors for the construction of logic gates depends upon their utility as fast switches. When the base-emitter diode is turned on enough to be driven into saturation, the collector voltage with respect to ground may be less than a volt and can be used as a logic 0 in the TTL logic family.

The use of transistors for the construction of logic gates depends upon their utility as fast switches. When the base-emitter diode is turned on enough to be driven into saturation, the collector voltage with respect to ground may be less than a volt and can be used as a logic 0 in the TTL logic family.