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gmc 发表于 2022-3-22 21:05

74LS21 fails with TL866

Testing a known good 74LS21 fails with  TL866II-Plus App Ver 11.90

[img]https://i.postimg.cc/jSjZ53mv/Screenshot-from-2022-03-22-13-18-42.png[/img]

yovish 发表于 2022-3-24 06:07

[b]回复 [url=http://forums.xgecu.com/redirect.php?goto=findpost&pid=1808&ptid=575]1#[/url] [i]gmc[/i] [/b]


   Please post a screenshot showing the erroneous test.

yovish 发表于 2022-3-24 21:41

I can already see the screenshot, it hasn't displayed for a while,

Yes this logic vector is wrong, because pins 3 and 11 are unused/not connected (NC), so instead of expecting the value "H" (TTL logic level high/logic value "1"), there should be an "X" there as shown. In some time this vector should be corrected. Thank you for the information.

Please have the administrator move the topic to this directory:
[url=http://forums.xgecu.com/forumdisplay.php?fid=17]http://forums.xgecu.com/forumdisplay.php?fid=17[/url]

yovish 发表于 2022-3-26 00:01

[b]回复 [url=http://forums.xgecu.com/redirect.php?goto=findpost&pid=1808&ptid=575]1#[/url] [i]gmc[/i] [/b]

   Out of curiosity I checked what the [b]logic vector[/b] of the [b]7421[/b] chip looks like from other companies. I found a couple of companies that also have the [b]wrong vector[/b], but I guess they don't have as much support as XGecu, which will have a revised [b]logic test[/b] any day now.

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