![]() ![]() (In the symbol, the input terminals are at left and the output terminal is at. When both the inputs are positive with value equal to VDD, the the output is always zero volts. In a circuit, logic gates will make decisions based on a combination of. When the two inputs are different, meaning one is with positive voltage equal to VDD and the other one is 0V then the output is always a logic one or equal to VDD value. Let's consider the two inputs as A and B, then referring to the above truth table we can see that when both the inputs are 0V, the output is also zero volts. Let's take the example of the first gate which has two inputs terminating at pin#1 and pin#2, and an output terminating at pin#3. Here,s logic high is always equal to the pin#14 VDD value, and the logic low is always 0V or equal to the pin#7 VSS value. As we already know that the IC 4070 includes 4nos of 2 input Exclusive OR gates or XOR gates.Įach of these gates have two inputs and one output.ĭepending on how the inputs are supplied with a positive of 0V supplies, the outputs produce a logic high or a logic low. ![]() the gate and diffusion capacitances for transistor M1 of Figure 0.7. Upper half is a line diagram showing four NAND gate. M, None, 3.2.3 For the circuit in Figure 0.2, Vs 3.3 V. The truth table for an XOR gate is as follows: Aįrom the above we can easily understand the working of the IC 4070 pinouts. The 7400 series is a popular logic family of transistortransistor logic (TTL) integrated circuits (ICs). This transistor utilizes low power and also has low-frequency. In a perfect world, all logic circuit signals would exist at these. If V CC is too low, the transistor will not have enough power and the amplified AC signal. Logic gate circuits are designed to input and output only two types of signals. V CC is a very important voltage when biasing the transistor because it determines how much the AC signal can be amplified to in the transistor. ![]() The IC 4070 consists of four XOR gates, each with two inputs (A and B) and one output (Y). The BC547 is used here in common emitter configuration. V CC of a bipolar junction transistor is the DC voltage that is supplied to the collector of the transistor. Pin 14: VDD or the Supply positive input. ![]()
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