[SI-LIST] Re: SSTL-2 differential receivers
- From: Scott McMorrow <scott@xxxxxxxxxxxxxxxx>
- To: sassouad@xxxxxxxxxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 24 Jan 2002 13:12:43 -0800
simon,
just drive one side of the sstl-2 signal directly into
a 2.5 volt cmos device with the standard vdd/2 termination.
the switching point of the differential signal should be
around Vtt (Vdd/2), which will be the same as the threshold
for standard CMOS (not TTL compatable CMOS), so the switching point
will be the same. You can adjust the termination resistor
to guarantee the necessary signal swing needed around
1.25 volts for the CMOS input.
Or you can
use a device like a xylinx virtex2 device which
has sstl-2 receivers and cmos drivers, along with built
in DLL's to synchronize the two, if necessary.
scott
Simon Assouad wrote:
> Hi All,
>
>
>
> I'm working with DDR SDRAM interface and need to convert a differential
> SSTL-2 clock signal into a single-ended 2.5v CMOS signal. Anyone has
> any recommendation on a specific component (what and how)?
>
>
>
> Thanks,
>
> Simon.
>
>
>
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--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR 97062-3090
(503) 885-1231
http://www.siqual.com
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