Those parts are FET based pass transistor level converters. They use the series FET and gate bias logic to protect against high voltage, but they do not provide actual buffering or additional pull-down current capability.
Go with a generic 'HCT part and you should have plenty of drive capability to turn on the opto. On 7/1/2019 10:10 AM, Doug LaRue wrote: > Hmm, I wired up the TXS0108E level shifters to a 3.3V Arduino Pro Mini and > while it shifted to 5V correctly, > when connected to the DB25 it could not pull the pins low. Eliminated that > part it would seem. > -- Charles Steinkuehler [email protected] -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/machinekit. To view this discussion on the web visit https://groups.google.com/d/msgid/machinekit/9326fd9d-e843-c85d-a6ba-bf0f35ed71c4%40steinkuehler.net. For more options, visit https://groups.google.com/d/optout.
