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SIEMENS SAB0529 PROGRAMMABLE DIGITAL TIMER CHIP 18DIP – Symkrilag UK
TLC551 IC Timer - CMOS 555 with 1V to 15V power, up to 1.8MHz [TLC551CP] : ID 5222 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Silicon die teardown: a look inside an early 555 timer chip
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