christianpax.blogg.se

When transistor Tc is removed from totem-pole configuration, then an open collector TTL gate is formed.

The output of the transistor drives supply voltage to output devices only if pull-up resistors are connected to the collector terminal.

The output of the transistor drives supply voltage to output devices only if pull-up resistors are connected to the drain terminal. Due to this external circuits can be connected so that it switches to ground in active state. It is termed as unconnected collector terminal of a PNP/NPN transistor. It is termed as unconnected drain terminal of a P/N type FET transistor. The output is a form of bipolar junction transistor circuit. The output is a form of FET transistor circuit. The below tabular column specifies the differences between open drain and open collector configurations. The benefit in the open-collector transistor configuration is no necessity of connecting the collector load voltage to be at the same level of voltage potential of transistor’s driving circuit where it can be either high or low. Other than connecting the output of an IC or any other transistor to specific device, it is connected to the NPN transistor’s base terminal where the collector is open and emitter terminal of the NPN transistor has internal connection with the ground pin. The open collector configuration operates like a switch which is either ground connected or disconnected.

Open Collector is the general output where one can find in various integrated circuits.

Today, we are going to discuss about open collector configuration, its TTL gate, characteristics and advantages. Those are Common Base, Common Collector and Common Emitter modes. As we know that BJT is a transistor and it has three terminals (Emitter, Base and Collector) where these terminals can be configured mainly in three switching modes. In the digital chip design, microcontroller applications and operational amplifiers, the open collector outputs are commonly used either for driving high loads such as relays or for interfacing with other circuits.