Multiple-emitter transistor

Multiple-emitter transistor is the specialized bipolar transistor mostly used at input of the TTL NAND logic gates. Than input signals are applied to the emitters, the collector current stop flowing only if all emitters are driven by the logical high voltage, thus performing AND logical operation in single transistor. Multiple-emitter transistor replaces diodes of the DTL and allows reduction of switching time and power dissipation.

See also

TTL

Logic families

Multiple gate transistor

Integrated injection logic - uses multiple collector transistors

External links

[book about TTL logic, section "Multi-emitter transistors"]

[Tutorial of the bipolar logic]