Integrated circuit application circuit pattern recognition method
To understand the role of each pin, please refer to the relevant IC application manual. After knowing the role of each pin, it is convenient to analyze the working principle of the external circuit of each pin and the role of components. For example: knowing that the ① foot is an input pin, then the capacitor connected in series with the ① foot is the input coupling circuit, and the circuit connected to the foot is the input circuit.
Three ways to understand the role of each pin of the integrated circuit
There are three ways to understand the role of each pin of an integrated circuit: one is to consult relevant information, the other is to analyze based on the internal circuit block diagram of the integrated circuit, and the third is to analyze the external circuit characteristics of each pin in the application circuit of the integrated circuit. The third method requires a good basis for circuit analysis.
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Circuit analysis steps
How to understand the IC circuit diagram?
Knowing some key test points of integrated circuits and the rule of pin DC voltage is very useful for repairing circuits. The DC voltage at the output of the OTL circuit is equal to half of the DC operating voltage of the integrated circuit. The DC voltage at the output of the OCL circuit is equal to 0V. The DC voltage at the two outputs of the BTL circuit is equal. Time is equal to 0V.
When a resistor is connected between the two pins of the integrated circuit, the resistance will affect the DC voltage on the two pins. When a coil is connected between the two pins, the DC voltage on the two pins is equal, Unequal time must be an open circuit. When a capacitor is connected between two pins or an RC series circuit is connected, the DC voltage of these two pins must be unequal. If they are equal, the capacitor has broken down. Under normal circumstances, do not analyze the working principle of the internal circuit of the integrated circuit, which is quite complicated.
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