I'm quite newbie in electronics, and I'd like to learn why there are AC timing characteristics to this particular EEPROM (24LC512) that I'm using but none for DC?

Does AC timing constraints apply to DC as well?

If not so, do I need to obey any timing constraints in my design if I were to use I2C bus with DC power supply for this chip?

  • 3
    \$\begingroup\$ There is no such thing as DC timing, because DC means the signal is never changing. Timing characterisics are called AC characteristics because the signal is changing. Nothing to do with AC vs DC power suply. \$\endgroup\$
    – MarkU
    Nov 25, 2015 at 21:11
  • \$\begingroup\$ DC characteristics are the things that dont require timing information, such as min/max supply voltage, max supply current demand, pin capacitance, switching threshold voltages,etc. AC characteristics are time-related. \$\endgroup\$
    – MarkU
    Nov 25, 2015 at 21:13
  • \$\begingroup\$ @MarkU Aha! But it is indeed strange way to tell this. I mean why on earth they don't call that timing constraints as just "Timing", ridiculous though :) \$\endgroup\$
    – Burak.
    Nov 25, 2015 at 21:14
  • \$\begingroup\$ The DC characteristics are usually in a section called "Electrical Characteristics". These basically tell you what DC voltage to apply to the chip. No timing as DC is 0Hz. \$\endgroup\$ Nov 25, 2015 at 21:15
  • \$\begingroup\$ In fact in that particular datasheet, Table 1-1 is actually labelled "DC Characteristics", and Table 1-2 is labelled "AC Characteristics". \$\endgroup\$ Nov 25, 2015 at 21:16

1 Answer 1


DC is simply constant w.r.t TIme.So there is no need of Timing characteristic for DC unless and until You are using a fixed vale of DC. One variable must be present for Timing(lets say U are varying the DC level or u r varying the Load and want to measure the current)

So..no need of Timing for DC.


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