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SN74HC373: maximum current

Ryoma Ohashi
Expert 3400 points
Part Number: SN74HC373
Other Parts Discussed in Thread: SN74LV373A, TPIC6273, SN74LVC373A, SN74AHC373, TPIC6B273

Hi team,

In the datasheet, it says maximum IO Continuous output current for VO = 0 to VCC is ±35 mA.

Is this for one channel? means that the device can drive 280mA （35mA＊８）？

I have heard of that there are current limitation by the package. Is there any documents that explain about this?

BTW, my customer is going to use SN74HC373APWR

Regards,

Ohashi

  • +1
    Guru 276380 points

    All specifications are per pin.

    Please note that the source/sink current of all outputs must flow through VCC or GND, so the VCC/GND limits do limit the total current.

    Also note that if you exceed the test conditions of the electrical characteristics (6 mA for VOL/VOHx with a 4.5 V supply), then the electrical characteristics are no longer guaranteed, and you might not have enough usable voltage for you load.

    There are devices with stronger outputs (SN74AHC373: 8 mA, SN74LV373A: 16 mA, SN74LVC373A: 24 mA). Only the LVC device has higher absolute maximum ratings. If you want even higher currents, consider the TPIC6B273/TPIC6273 (up tp 250 mA per pin).

  • 0 in reply to Clemens Ladisch
    TI__Expert 3400 points

    Hi Clemens,

    Thanks for your reply.

    >Please note that the source/sink current of all outputs must flow through VCC or GND, so the VCC/GND limits do limit the total current.

    So, you mean, the total current limit is 70mA for this device?

    Regards,

    Ohashi

  • 0 in reply to Ryoma Ohashi
    TI__Guru* 96742 points

    Hello Ohashi-san,

    Yes, the "Continuous current through VCC or GND" is the correct specification for the maximum total current output from the device.

    Please note that you can output 70mA in the high state (from VCC) and 70mA in the low state (to GND) at the same time, however it is not something I would recommend doing.

    Do you know why the customer is asking about this information? Most normal applications will not need anywhere near this amount of current.