>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 09 March 2006 12:36
>To: Microcontroller discussion list - Public.
>Subject: RE: [EE] LVTTL Schmitt trigger non-inverting buffer - 
>dotheyexist in tiny packages?
>
>
>At 11:56 AM 3/9/2006 +0000, you wrote:
>
>>I would be happy to do that, but as with some Philips products I have
>>found, they appear to have a VERY loose idea of what LVTTL 
>is.  That part 
>>says LVTTL compliant at 3volts (which would be awkward 
>anyway) but the 
>>min/max thresholds at that voltage are 2.2v and 0.6 rather 
>than 2.0v and 
>>0.8v.  Probably close enough from my point of view, but customer is 
>>insistant on meeting the actual LVTTL levels after problems 
>with another 
>>vendors part.
>
>It's within the LVTTL spec, but with reduced noise margin 
>(200mV rather than 400mV)
>

The spec we have been given is 0.8v/2.0v, so 0.6v/2.2v could concievably not work at all.

>The output spec is 400mV/2.4V.
>
>But you'd have to operate it at 3.0V rather than 3.3V, as you note.
>
>Maybe you're going to have to design your own ST with a 
>comparator and some 1% resistors if you really need to meet 
>this spec. But then your size constraint bites you on the butt..

Unfortunately this looks like it might be the only realistic solution.  Thanks for everyones input.

Regards

Mike

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