1, first of all, we need to search the Internet for the schematic diagram of the chip you need, as well as the pin function of the chip, after the search will save the picture found to the computer, as shown in the figure; (Here we take 74ls138 as an example)
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2, open the Protel99se software, open our schematic device drawing interface.
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3. After entering the device, click the icon in the device bar in the figure, as shown in the figure, and the interface for naming new components will appear. The name here is \"74LS138\";
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4, after the completion of the new, you can begin to draw the device, first draw the general style of the components, use the arrow in the figure pointed to the tool, as shown in the figure;
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5. After placing the device frame, place the pin of the device and set the pin number, as shown in the figure; (Start with 1)
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6, after the drawing is completed, the general figure is shown, then we double-click the pin, modify the pin name;
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7, as shown in the jump option box to modify your pin name, each should be modified to its corresponding pin name. As shown in the figure; (Remember to save after modification)
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