Image: NXP-7555-HD

Description: The NXP 7555 is a CMOS version of the 555 timer. The 'unused' vias on the folded resistors at the top and at the center of the chip are used to trim resistance by modifying only one metal layer mask. Large multifingered 'power' transistors are visible.
Title: NXP-7555-HD
Credit: http://zeptobars.ru/en/read/NXP-7555-555-timer
Author: ZeptoBars
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