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Low-power CMOS timer

TLC555 Internal Circuitry

Explore the internal circuitry and functional stages of TLC555.

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Inside TLC555

CMOS comparators, latch and output inside one IC.

Compact TLC555 functional cutaway with reference divider, two comparators, latch, reset and CMOS discharge switch.
Functional architecture; reference resistors are not specified as the bipolar NE555 5 kΩ chain.

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Two thresholds establish the timing window.

Remember

The latch retains its state between crossings.

Switch

CMOS output and discharge paths change together.

Component view