A totem-pole output sources current out to the load and sinks current in. Note that the current paths are different between a high and low pulse. Although not labeled the Totem-Pole is formed by the two output transistors. Related page that covers all NOR Gates styles.Īnother example of a 3-input NOR gate with a Totem-Pole Output. The output structure will be some deviation of a Totem-Pole but the actual schematic will change depending upon the Logic Family used.ħ4HC27, 74HCT27, 54HC27, 54HCT27, 54AS27, 54ALS27, 54F27 The schematic and logic diagram are examples of 3-input NOR gates. The Totem-Pole is formed by transistors Q1 and Q2. The circuit schematic shown below details the internal structure of a TTL triple input NOR gate with a Totem-Pole Output. As opposed to an Open Collector Output which is always indicated in the title of the data sheet. An IC with a Totem-Pole Output is the default condition. Many ICs use Totem-Pole Outputs, in fact it's so common that the output structure isn't mentioned in the data sheet title. A type of output structure used with integrated circuits in which one transistor drives the output high while another transistor connected below it pulls the output low. Definition of Technical Terms for Engineers "A" "B" "C",
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