What is the role of the pulldown resistor pull-down any stray voltage to ground Give defined input when the switch is not pressed protect the IC from burning protect the switch?

What is the role of the pulldown resistor pull-down any stray voltage to ground Give defined input when the switch is not pressed protect the IC from burning protect the switch?

A pull-up resistor connects unused input pins (AND and NAND gates) to the dc supply voltage, (Vcc) to keep the given input HIGH. A pull-down resistor connects unused input pins (OR and NOR gates) to ground, (0V) to keep the given input LOW.

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. …

Why do people use totem poles?

Carvings on these poles, like those of the house frontal poles, are often used as a storytelling device and help tell the story of the owners’ family history. House posts were carved by the Coast Salish and were more common than the free-standing totem poles seen in Northern cultural groups.

What makes up a totem pole in a circuit?

1. Totem Pole : Totem pole consists of pull up and pull down transistors along with the diode resistor.Totem pole operates at high speed. The two transistors used drives a high output and another pulls it down in an Integrated circuit. 2.

What do you call active pull up on a totem pole?

Since an active device is used for charging CL, this operation is called as active-pull-up. Thus active-pull-up consists of T3 on top of T4.

What’s the difference between a pull up and a pull down resistor?

A Pull-up resistor is used to make the default state of the digital pin as High or to the logic level (in the above image it is 5V) and a Pull-Down resistor does exactly opposite, it makes the default state of the digital pin as Low (0V).

Why is a totem pole used in an audio amplifier?

An audio power amplifier applies a positive voltage at a high current and a negative voltage at a high current to a low resistance speaker. So the upper transistor (NPN) in the totem pole pulls the speaker positive then the lower transistor )PNP pulls the speaker negative.