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Science Forum Index » Electronics - Misc Forum » 7406 "open collector" output characteristics
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| Henry |
 Posted: Wed Mar 21, 2007 1:37 pm |
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Here is a question for some old-timers:
I need to parallel several 7406 outputs in order to sink more current.
But each time I add one more, I also add its capacitance.
So I need to know: what is the "output capacitance" of each 7406 open
collector output transistor when in the "high" state?
Thanks for any serious responses...
Henry |
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| John Bordynuik |
| Posted: Fri Mar 23, 2007 9:33 am |
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John Bordynuik selects "I need to parallel several 7406 outputs in order to
sink more current."
Why not use a transistor to sink the current?
How much current do you need to sink?
If you are referring to an old TTL part then the capacitance is very low.
You could determine it from propogation delay tests or rise time from a high
value resistive load. In any event it would probably be very low and could
vary from component to component a bit... I doubt you will find this
information in a datasheet.
Regards,
John Bordynuik |
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| Neil J. Harris |
| Posted: Sun Mar 25, 2007 6:37 am |
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In message <1174502240.880806.50710@d57g2000hsg.googlegroups.com>, Henry
<ultrasonic@att.net> writes
Quote: Here is a question for some old-timers:
I need to parallel several 7406 outputs in order to sink more current.
But each time I add one more, I also add its capacitance.
So I need to know: what is the "output capacitance" of each 7406 open
collector output transistor when in the "high" state?
Thanks for any serious responses...
Henry
Why not use a proper low side driver or SMT fets?
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Neil J. Harris |
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