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SN74LVC00A-Q1: SN74LVC00A-Q1 Recommended Supply Voltage vs other LVC devices

Trey German8
Expert 1930 points
Part Number: SN74LVC00A-Q1
Other Parts Discussed in Thread: SN74LVC1G97-Q1

I'm using a bunch of Q100 LVC family logic devices to implement some failure mode logic in a safety critical application.  All of the other devices I've designed in are operating off a 5V rail and this is within the recommended operating conditions in the datasheet for these parts.  However, the quad NAND device in the LVC family is only recommended to operate up to 3.6V supply voltage. 

  • Is this a mistake in the datasheet?
  • OR Is there something in the implementation of the gates that limits operational voltage to something less than what the process could normally handle?
  • OR Was it just not a business priority to characterize this particular part at 5V?

Thanks!

Trey

  • 0
    Guru 281330 points

    All LVC "Little Logic" devices (with "1G"/"2G"/"3G" in their name) can run at 5 V, but all the larger LVC devices are rated for 3.3 V. I suspect that switching all outputs at the same time would generate excessively large current spikes.

    You could use a family with weaker output drivers, such as AHC. If you need LVC, use multiple Little Logic devices.

    If you're using NAND gates to create other logic functions to keep the BOM count down, consider using configurable logic gates, such as the SN74LVC1G97-Q1.