piclist 2001\01\19\112631a >
Thread: Need 74HC165 with tristate output
www.piclist.com/techref/ios.htm?key=output
picon face BY : Robert Young email (remove spam text)



From: "Brian Aase" <@spam@ulcsa.....spamKILLspamESKIMO.COM>
To: <TakeThisOuTPICLIST.....spamMITVMA.MIT.EDU>
Sent: Friday, January 19, 2001 10:12 AM
Subject: [EE]: Need 74HC165 with tristate output


> I'm starting a project in which a number of inputs (>16) need to
> be periodically read via the SSP (SPI) bus.  In the beginning it
> looked like using a few 74HC165A's would be just the thing,
> until I realized that the outputs are not tristate.  Thus I can't
> tie multiple outputs together onto the SDI line :-(
> Can anyone suggest a chip with a similar function that DOES
> have a tristate output?
> Brian Aase

If you have the room to add a chip besides the HC165's, how about HC125.
Pull G* low and it is transparent, G* high makes the gate output 3-state.

Rob Young
KILLspamrwyoung@spam@spam.....ieee.org

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