What is an open collector comparator?

What is an open collector comparator?

An open collector output is an output device that is attached to an open collector of a transistor. A perfect example of an open collector output are voltage comparators. Pretty much all voltage comparator chips, such as the LM311, the LM393, and the LM339 all function as output collector outputs.

Is comparator an open loop?

The open-loop op-amp comparator is an analogue circuit that operates in its non-linear region as changes in the two analogue inputs, V+ and V- causes it to behave like a digital bistable device as triggering causes it to have two possible output states, +Vcc or -Vcc.

What is open collector mode?

An open collector is a common type of output found on many integrated circuits (IC), which behaves like a switch that is either connected to ground or disconnected. The emitter of the transistor is connected internally to the ground pin.

How does an open collector circuit work?

An Open Collector Digital Output behaves similarly to a Solid State Relay, by toggling the state of the output, you can switch a circuit on and off. This type of output does not supply power to the load like an ordinary digital output, it simply switches a powered circuit to ground.

Is open-drain high impedance?

Open-drain outputs are useful when multiple gates or pins are connected together, such as with the I2C bus. When a device is not using the bus, the open-drain output is in high-impedance mode and the voltage level is pulled high by the pull-up resistor.

What is the advantage of open-drain?

The advantages of the open-drain configuration are three-fold: first, the ability to directly drive a load; second, (and probably more importantly) the ability to switch external sources that may have higher or lower voltages than Vdd; and third, multiple open-drain sensors (such as the RR131) can be connected in a …

How op amp works as a comparator?

A comparator is an electronic circuit, which compares the two inputs that are applied to it and produces an output. An op-amp consists of two input terminals and hence an op-amp based comparator compares the two inputs that are applied to it and produces the result of comparison as the output.

Is open collector NPN or PNP?

The various terms are used somewhat loosely, and often all variations are simply called “open-collector”, but following is the most common usage: Open-collector = NPN = Changes between open and low. Open-drain = PNP = Changes between open and high.

What is open drain or open collector?

Open-Collector An “open collector” is functionally the same as an “open drain”. An “open collector” refers to a current sink on a BJT transistor output, while an “open drain” refers to a current sink on a FET output.

Why is push-pull faster than open drain?

Open drain output has higher power consumption during active transfers due to the pull-up resistors that are used. In general, the push-pull output has faster slopes than the open drain output.

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