#Totem pole output driver driver
The output driver of claim 7, wherein the multiplexers are complimentary metal oxide semiconductor (CMOS) multiplexers.ĩ. The output driver of claim 1, wherein the first selection unit and the second selection unit are multiplexers.Ĩ. The output driver of claim 2, wherein the first inverter and the second inverter comprise a PMOS (P-type Metal Oxide Semiconductor) and an NMOS (N-type metal oxide semiconductor).ħ. The output driver of claim 2, wherein the first inverter has a longer delay than the second inverter.Ħ. The output driver of claim 3, wherein the inverters in the second delay element are matched to inverters in the first delay element.ĥ. The output driver of claim 1, wherein the second delay element comprises a first inverter and a second inverter in series.Ĥ. The output driver of claim 1, wherein the first delay element comprises a first inverter and a second inverter in series.ģ. Read more on 3-State Outputs.A first delay element outputting a delayed first driver signal Ī first selection unit receiving as a first input a first driver signal and as a second input the delayed first driver signal a second delay element outputting a delayed second driver signal Ī second selection unit receiving as a first input a second driver signal and as a second input the delayed second driver signal Ī selection signal for the first selection unit being the delayed first driver signal, and the selection signal for the second selection unit being an inverted first driver signal, such that a path that is not presently driving is switched off first, prior to the opposing driver being turned on.Ģ. When the IC has a Tri-state control pin, both output transistors may be placed in the off condition. The different components and the different impedances of the transistors causes a difference between the rise time and the fall time of the output pulse. Depending on the logic function and the logic family there may be components in one or both paths in addition to the switching transistors Q1 and Q2. So a rising pulse sees the impedance path of Q1 while a falling pulse see the impedance path of Q2. Or an output high is derived from Vcc through Q1, and an output low is derived from Q2 to ground. 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",