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That requires some detective work.
If you know where it is in a circuit, you might be able to figure out its function by context (seeing what it's connected to and what it might do).
You might be able to figure out the manufacturer by looking at subtle details of the package size and shape.
If you have the equipment, there are ways to disassemble and reverse engineer the chip and see the circuitry through a microscope to figure out its internal schematic.
Wiki User
∙ 15y ago
Wiki User
∙ 11y agogd noon, you can check an IC only with the Oscilloscope not with a Multmeter.because IC has its data sheet parameters
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