555

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• Quick math facts about 555 (number theory)

  • 555 = 3 × 5 × 37
  • Divisible by 3, 5, 15
  • Binary: 1000101011
  • Roman numeral: DLV
  • Sum of digits = 15

• 555 timer IC (electronics)

  • Monostable: pulse width t = 1.1 × R × C (R in ohms, C in farads)
  • Astable: f ≈ 1.44 / [(R1 + 2R2) × C], with high time t_high ≈ 0.693 × (R1 + R2) × C and low time t_low ≈ 0.693 × R2 × C
  • Common formulas and pinout summary

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