There is a very detailed application note from Philips regarding these level shifters: https://cdn.sparkfun.com/tutorialimages/BD-LogicLevelConverter/an97055.pdf As far as I understand it, what Mia describes is explained in section 2.3.1 State 2. The newer Pi1541 design uses a 7406 for the output signals and only runs the inputs through the BSS138. /Hans On 2020-01-10 12:04, Mia Magnusson wrote: > Den Tue, 7 Jan 2020 11:58:04 -0600 skrev Jim Brain <brain_at_jbrain.com>: >> On 1/7/2020 4:24 AM, Mia Magnusson wrote: >>> Btw the level converters Raj Wurttemberg linked to will damage the >>> PI after a while if using more than one device on the IEC bus (in >>> addition to the PI), so for example combining a PI1541 with a real >>> 1541 should be done with the unidirectional active level converters >>> instead of those passive-ish bidirectional converters. >> How so? The FETs are open drain, so do not drive a high voltage at >> all, they just sink current. > Afaik all the sink current goes through the PI when using that > bidirectional converter. Therefore the slightly newer PI1541 hardware > with unidirectional level converters is the recommendation. >Received on 2020-05-30 00:13:46
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