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What is power latch?

L

Lord Garth

Jan 1, 1970
0
Dear All,

Product A "shall enable the power latch upon startup"?

What is that mean?

Best regards,
Boki.

I'm supposing you are referring the tendency of the "A" series CMOS
components (4000 series chips) to latch up when power is applied.

This is due to a parasitic SCR inherent in its design. Looking through
the layers, there would be a PNPN structure. If this latches on, there
would be a destructive current flow causing the chip to self destruct.
 
J

Jasen Betts

Jan 1, 1970
0
Dear All,

Product A "shall enable the power latch upon startup"?

Sounds like the device attached to the back if the on/off button :)
What is that mean?

Means they used google-translate or similar :)

Bye.
Jasen
 
P

Pooh Bear

Jan 1, 1970
0
Dear All,

Product A "shall enable the power latch upon startup"?

What is that mean?

As ever Boki, you manage to have trouble describing your problem.

Now start at the beginning.......

Graham
 
==============
3.1 Startup
3.1.1 Startup Power Latch
A shall enable the power latch upon startup.

3.1.2 Software Version
Upon power-up, A shall write the software version to address 0x1234
==============

:) Any advice?

Best regards,
Boki.
 
J

JeffM

Jan 1, 1970
0
Product A "shall enable the power latch upon startup"?
What [does] that mean?
Boki.

If it is not clear from the document, then the document is incomplete.
At a minimum, contact the individual who wrote the document;
better yet, have him re-write it so that things are clear.
Fuzzy specs benefit no one.
..
..
This was my interpretation of the prose:
Upon starting a Master Device, all slave devices are enabled.
Example:
http://groups.google.com/group/sci....ant-the-dust-colector-to-automaticaly-come-on
..
..
I sounds like Jasen interpreted the sequence of events correctly:
(Google-translate).
 
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