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I ask this question, just out of curiosity. In this die of 556 IC, what are the wave-like squiggle at the four corners, and two more on the top?

enter image description here

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  • \$\begingroup\$ Awesome! We need more semiconductor design questions here. \$\endgroup\$ – Connor Wolf Mar 25 '14 at 4:18
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Those are high-current NPN transistors. Here, from the designer's book:

enter image description here

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Those are the large transistors required to drive the output pins: two for each of the totem-pole main outputs and one for each of the open-collector discharge pins. Those transistors need to handle on the order of 200 mA each, so they need to be much larger than the internal analog/logic transistors.

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