why totem pole outputs cannot be connected together

The presence of schottky diode between the base and the collector prevents the transistor from going into saturation. How schottky transistors are formed and state its use ?Ī schottky diode is formed by the combination of metal and semiconductor. Output is disconnected from rest of the circuits by internal circuitry.ġ7. What happens to output when a tristate circuit is selected for high impedance ? When noise voltages are within the limits of VNA(High State Noise Margin) and VNK for a particular logic family.ġ4. When does the noise margin allow digital circuits to function properly ? This type of gateis called HTL logic or High Threshold Logic.ġ3. Some digital circuits operate in environments, which produce very high noise signals. For operation in such surroundings there is available a type of DTL gate which possesses a high threshold to noise immunity. Operating temperature of the IC vary from 0 0C to 70 0c. The temperature in which the performance of the IC is effective is called as operating temperature. It is expressed in volts.įan in is the number of inputs connected to the gate without any degradation in the voltage level.Īll the gates or semiconductor devices are temperature sensitive in nature. It is the maximum noise voltage added to an input signal of a digital circuit that does not cause an undesirable change in the circuit output. Propagation delay is the average transition delay time for the signal to propagate from input to output when the signals change in value. Power dissipation is measure of power consumed by the gate when fully driven by all its inputs. Important characteristics of digital IC’s are as follows :įan out specifies the number of standard loads that the output of the gate can drive with out impairment of its normal operation. Mention the important characteristics of digital IC’s ? The bipolar logic family is classified as follows :ĥ.

Mention the classification of saturated bipolar logic families ? (2) Metal oxide semiconductor family (MOS)Ĥ. (1) Junction Field Effect Transistor (JFET) State the classifications of FET devices ? The Schottky TTL, and ECL logic comes under the unsaturated logic family.ģ. The RTL, DTL, TTL, I2L, HTL logic comes under the saturated logic family. The Bipolar logic family is classified into :

1. Give the classification of logic families ?Ĭlassified of logic families is as follows :Ģ. Classify the logic family by operation ?

Why totem pole outputs cannot be connected together