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 Post subject: Re: the new PC-USB-Terminal III adapter !!
PostPosted: October 11th, 2017, 18:06 
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Joined: September 8th, 2009, 18:21
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Location: Australia
I don't know how the later versions of the USB adapter differ from the first, but ISTM that the earlier version could be upgraded by replacing the SN74AHC1G14 IC nearest to the HDD header with an MC74VHC1GT04 or SN74LV1T04.

MC74VHC1GT04, ON Semiconductor, Inverting Buffer / CMOS Logic Level Shifter, 1.8V to 3V logic, TSOP-5, Vih = 1.4V, Vil = 0.53V @ 3.3V:
https://www.onsemi.com/pub/Collateral/M ... GT04-D.PDF

SN74LV1T04, Texas Instruments, Single Power Supply Inverter Gate CMOS Logic Level Shifter, 1.8V - 5.5V, SOT-23(5), Vih = 1.35V, Vil = 0.8V @ 3.3V:
http://www.ti.com/lit/ds/symlink/sn74lv1t04.pdf

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 Post subject: Re: the new PC-USB-Terminal III adapter !!
PostPosted: October 11th, 2017, 18:39 
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Joined: October 16th, 2013, 13:21
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Location: Brazil
Out of curiosity : would an adapter modified in this way still work with older drives that use 2.5/3.3V ?


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 Post subject: Re: the new PC-USB-Terminal III adapter !!
PostPosted: October 11th, 2017, 18:55 
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rogfanther wrote:
Out of curiosity : would an adapter modified in this way still work with older drives that use 2.5/3.3V ?

Yes. The point is that any input greater than Vih will register as a logic HI, and any input less than Vil will be seen as a logic LO.

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