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SN74HCS164-Q1: Output current

Youhei Miyaoka
Expert 3865 points
Part Number: SN74HCS164-Q1
Other Parts Discussed in Thread: SN74HCS164, SN74AC164-Q1, CD74AC164, TLC6C598-Q1

Tool/software:

Hi team,

My customer need to check circuit feasibility. They will use SN74HCS164 as LED indicator and its schematic is below.

LED is 15mA/ch and total maximum current is 75mA. Can this device handle this current?

Could you also teach me how to read maximum current in datasheet?

Regards,

Youhei MIYAOKA

  • 0
    Guru 316440 points

    The test condition for VOH is 6 mA; for larger currents, the output voltage is not guaranteed. The absolute maximum rating for the total output current is 70 mA; 75 mA can destroy the chip.

    The CD74AC164/SN74AC164-Q1 allows higher currents.

    In general, for higher loads, you invert the signal and use a low-side driver like the TLC6C598-Q1.