What is meant by totem pole output?

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What is meant by totem pole output?

In the TTL family, the Totem-pole circuit on the output is used to provide active pull-up and active pull-down. 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.

Q. What is totem pole output in TTL?

Totem Pole Output Totem Pole means the addition of an active pull up the circuit in the output of the Gate which results in a reduction of propagation delay. Totem Pole Output TTL. Logic operation is the same as the open collector output.

Q. Why does the TTL family use a totem-pole circuit on the output?

In the TTL family, the Totem-pole circuit on the output is used to provide active pull-up and active pull-down. 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.

What are the output configurations are available for TTL logic?

Q. What are the three types of output configuration for TTL?

In any case, TTL gates in all the available series come in three different types of output configuration:

  • Open-collector output.
  • Totem-pole output.
  • Three-state output.

Q. What is the totem pole configuration?

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. The Totem-Pole is formed by transistors Q1 and Q2.

Q. Is CMOS faster than TTL?

TTL chips are generally faster than CMOS gates (but see ACT series), however there are two logic technologies faster than TTL-Emitter-coupled logic (ECL) and gallium arsenide (GaAs). These chips come at considerable cost in power consumption and ease of interface to other logic families.

Q. What is TTL logic family?

Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors. Its name signifies that transistors perform both the logic function (the first “transistor”) and the amplifying function (the second “transistor”), as opposed to resistor–transistor logic (RTL) or diode–transistor logic (DTL).

What is totem-pole digital electronics?

Totem-Pole Output. 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. The Totem-Pole is formed by transistors Q1 and Q2.

Q. How many types of output configurations are there in TTL?

three different types
TTL gates are available in three different types of output configurations. Totem-pole output gates are used in most logic; in this case, the gate by itself drives its output HIGH or LOW depending on the gate’s inputs.

Q. Why totem pole outputs Cannot be connected together?

Why totem pole outputs cannot be connected together? connection are used, then a large current from supply +V will flows to ground through high state gate transistor and low state gate transistor. Thus, large current will flow which damages the output transistors of totem pole TTL arrangement.

Totem-Pole Output. 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.

Q. How does a TTL circuit work?

The most basic TTL circuit has a single output transistor configured as an inverter with its emitter grounded and its collector tied to Vcc with a pull-up resistor, and with the output taken from its collector.

Why should output outputs of different TTL gates not be connected together?

Outputs of different TTL gates that employ the totem-pole configuration must not be connected together since differences in their output logic will cause large currents to flow from the logic ‘1’ output to the logic ‘0’ output, destroying both output stages. The output of a typical TTL gate under normal operation can sink currents of up to 16 mA.

Q. What is the difference between open collector output and pole output?

Totem Pole output drives the output high and low. Open collector will only pull the output low; it does not drive the output high, only releases the output to float. Multiple open collector outputs may be tied together to operate in a wire-OR arrangement, where any output may pull the output low. In this case, a pullup resistor is used

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