The digital logic gates are the main building blocks of any digital circuit either it is in the discrete component form or an integrated package. Logic gates make up.Digital Logic Gates Summary. Transistors make up logic gates. Christmas and the New year 2021 Activity DetailsA collection of transistors and resistors that implement Boolean logic operations in a circuit. As we have seen throught this Digital Logic tutorial section, the three most basic logic gates are the: AND, OR and NOT gates, and given this set of logic gates it is possible to implement all of the possible Boolean switching functions, thus making them a. Individual logic gates can be connected together to form a variety of different switching functions and combinational logic circuits.
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Common chip models of OR gates are: 74LS32, etc.The output terminal is always opposite to the input terminal. Common chip models of AND gates are: 74LS08, 74LS09, etc.When one of the input terminals A and B is 1, the output terminal Y is 1 when the input terminals A and B are both 0, Y will be 0. (Logic 1 represents high level logic 0 represents low level)Only when the input terminals A and B are both 1, the output terminal Y is 1, otherwise, Y is 0. The gate implementing AND operation is AND gate, that implementing OR operation is OR gate, and that implementing NOT operation is NOT gate, also called inverter gate, etc.
Common chip models of NOR gates are: 74LS02, etc.AND-OR-NOT Truth Table II RS Flip-flop 1. When the input terminals A and B are both 0, Y will be 1. Common chip models of NAND gates are: 74LS00, 74LS03, 74S31, 74LS132, etc.As long as one of the input terminals A and B is 1, the output terminal Y is 0.
After both input signals are removed at the same time (back to 1), because the delay time of the two NAND gates cannot be determined, it ' s not sure whether the flip-flop state is 1 or 0. This is equivalent to storing the level signal at a certain moment in the S terminal, which reflects the memory function of the flip-flop.(4) When the R and S end are all valid, the trigger state is uncertain.Under this condition, the output terminals Q and Q' of the two NAND gates are both 1. For example, when you add a negative pulse to the S terminal to set the trigger to 1, after it returns to the high level, the flip-flop remains in the 1 state. When a flip is required, a negative pulse must be added to one input terminal. Since setting 0 or 1 is valid only when the trigger signal is low level, therefore, the S end and R end are drawn with small circles(3) When terminal R and S are all invalid, the trigger state remains unchanged.When the flip-flop state remains unchanged, the input terminals are all added with an invalid level (high level). The logic symbol is shown in Figure 1(b).
It is a kind of logic gate circuit commonly used in digital electronics , which has been applied earlier and is relatively mature.TTL is mainly composed of a BJT ( bipolar junction transistora>) and a resistor. III TTL Logic Gate CircuitA circuit with a bipolar semiconductor as the basic element, integrated on a silicon chip, with certain logic functions is called a bipolar logic integrated circuit, or TTL logic gate circuit. When the input signal changes, the output will change immediately. Characteristic E quation(1) The basic RS flip-flop has the functions of setting, resetting, and maintain (memory) (2) The trigger signal of the basic RS trigger is valid at a low level, which belongs to the level trigger mode (3) The basic RS flip-flop has constraints (R+S=1), because the delay time of the two NAND gates cannot be determined, when R=S=0, the next state will be uncertain.(4) It has a poor anti-interference performance.
CMOS InverterThere are two types of MOSFETs: P-channel and N-channel , and there are depletion and enhancement type in each. CMO devices currently compatible with TTL, such as 74HCT series, can be exchanged with TTL devices.Let's discuss the CMOS inverter first, and then introduce other CMO logic gate circuits. With the improvement of the manufacturing process, the performance of the CMOS circuit may surpass TTL and CMOS may become the dominant logic device.The working speed of the CMOS circuit can be compared with TTL, and its performance in power consumption and anti-interference are much better than TTL.In addition, almost all ultra-large-scale storage devices and PLD devices are manufactured using CMOS technology, and the cost is relatively low.The CMOS gate circuit produced in the early stage was the 4000 series, which was subsequently developed into the 4000B series. CMOSCMOS logic gate circuit is the second widely used digital integrated device developed after the advent of the TTL circuit. IV CMOS Logic Gate Circuit 1. However, because TTL has large power consumption, it is gradually replaced by CMOS circuits.
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