![]() ![]() ![]() The design requires a bipolar power supply (or an output capacitor). This is why you see this design (or its variations ) used in output transformer less (OTL) amplifiers. The main advantage of TTL with a "totem-pole" output stage is the low output resistance at output logical "1",Īlso, the addition of an active pull up the circuit in the output of the Gate results in the reduction of propagation delay.Įasily damaged by static discharge and voltage spikes.Ĭonsumes more power than CMOS – not suitable for battery-operated devices.Ĭonsumes more power than CMOS. The totem pole design can be configured with cathode followers for an even lower output impedance. In TTL the output stage has two transistor amplifiers (one CE and another CC) connected in a push-pull configuration to act as current sink and source at the output stage. In the TTL family, the Totem-pole circuit on the output is used to provide active pull-up and active pull-down. ![]()
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