SN74LVC1G373: Default output state is undefined...is the device still in push-pull mode?

Michael Roberts20

Part Number: SN74LVC1G373

Hello,

When this latch IC is in it's undefined state (I have found it is most often high), is the device still in push-pull operation? I would like to try to define the undefined state by adding a weak pullup on the output of the device to ensure it is always high on startup, but this would not be useful if the device is still in push-pull mode on startup.

Any help here would be greatly appreciated.

Thanks,

Mike

over 5 years ago

0 Emrys Maier over 5 years ago

TI__Guru* 96601 points

Hi Michael,
By "undefined" we just mean to say that we don't know what state the output is in. It could be driving high, or it could be driving low. There's no good way to know for certain without clocking data through. The output is push-pull and will be driving unless the OE\ pin is de-asserted (driven HIGH), in which case the output will be high-impedance. If the output is high-impedance, the internal latch will still have an unknown output at startup, but at least you can force the output high with a pull-up resistor. It all depends on your system's design.

0 Michael Roberts20 over 5 years ago in reply to Emrys Maier

Prodigy 50 points

Thanks for the quick response Emrys!

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SN74LVC1G373: Default output state is undefined...is the device still in push-pull mode?