74LS32SC vs 74LS00SC
| Part Number |
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| Category | Logic - Gates and Inverters | Logic - Gates and Inverters |
| Manufacturer | National Semiconductor | National Semiconductor |
| Description | OR GATE, TTL | NAND GATE, TTL, PDSO14 |
| Package | Bulk | Bulk |
| Series | - | - |
| Features | - | - |
| Voltage - Supply | - | - |
| Operating Temperature | - | - |
| Mounting Type | - | - |
| Package / Case | - | - |
| Supplier Device Package | - | - |
| Number of Circuits | - | - |
| Number of Inputs | - | - |
| Current - Output High, Low | - | - |
| Current - Quiescent (Max) | - | - |
| Logic Type | - | - |
| Max Propagation Delay @ V, Max CL | - | - |
| Logic Level - Low | - | - |
| Logic Level - High | - | - |
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1. What is a logic gate in an IC?
A logic gate in an IC is an electronic component used to perform logic operations. Logic gates are often used to implement basic logic functions such as AND, OR, NOT, etc., and are the basic building blocks in digital circuits.
The working principle of the logic gate is based on the properties of semiconductor materials, especially PN junctions. When a voltage is applied between the source and the drain, current will not flow through this barrier without a gate voltage. However, when an appropriate voltage is applied to the gate, it changes the electric field distribution at the PN junction, allowing current to pass. In short, the gate voltage controls the flow of current from the source to the drain, which enables the transistor to be used as a switch: closed when there is no gate voltage and open when there is a gate voltage.
In integrated circuits (ICs), logic gates usually refer to field effect transistors (FETs) or metal oxide semiconductor field effect transistors (MOSFETs). These transistors have three terminals: source, drain, and gate. The source and drain are the entrance and exit of the current, while the gate is used to control the flow of current. By controlling the gate voltage, the switching control of the current in the circuit can be achieved, thereby performing various logical operations. -
2. Which logic gate can be used as a controlled inverter?
IGBT can be used as a controlled inverter. IGBT (insulated gate bipolar transistor) is a commonly used power electronic device with high input impedance and low on-state voltage drop, which is very suitable for the production of inverters.
The application of IGBT in inverters is mainly reflected in its ability to control the switching state of power electronic equipment. By controlling the on and off of IGBT, the conversion and control of electric energy can be achieved. The switching speed of IGBT is fast, which can meet the requirements of the inverter for response speed. At the same time, its high voltage and high current resistance characteristics make it perform well in high voltage and high current occasions. -
3. Why is it called an inverter?
The name inverter comes from its working principle of converting direct current into alternating current, that is, "reversing" the operation of the rectifier. The inverter was originally called an "inverter" because it converts direct current into alternating current, which is the opposite of the working principle of the rectifier.
The definition and basic function of the inverter is to convert direct current power into alternating current. It is a device that converts the power of a DC power source such as a battery or storage battery into alternating current power for use by various devices that require AC power.
The history of the inverter also reflects the origin of its name. Early inverters were devices that converted AC to DC, while modern inverters reversed the process and converted DC to AC. With the development of technology, inverters have changed from mechanical devices to devices with solid-state circuits, becoming an important part of the field of power electronics. -
4. What is the use of the logic gate?
The main function of the logic gate is to control the switching and logical operation of the signal. The logic gate receives the input signal and controls the state of the output signal according to the logical state of the input signal (such as high level or low level), thereby realizing basic logical operation functions such as AND, OR, NOT, etc.
Specifically, the working principle of the logic gate is based on the structure and characteristics of the transistor. The transistor has three main parts: source, drain and gate. The gate adjusts the current flow between the source and drain by controlling the voltage, thereby realizing the switching function. When the gate voltage reaches a certain threshold, a conductive channel is formed between the source and the drain, and the current can pass; otherwise, the current is blocked.
Logic gates have a variety of applications in digital circuits, including but not limited to:
Remove noise coupled into the circuit, improve system reliability.
Speed up the turn-on and turn-off of transistors, reduce turn-on and turn-off losses.
Reduce transistor DI/DT, protect transistors and suppress EMI interference.
Protect the gate, prevent gate breakdown under abnormal high voltage conditions.
Increase drive capability, and drive transistors under smaller signals.
