[SI-LIST] Re: CLK Input not 3.3V tolerant
- From: evillaf@xxxxxxxxx
- To: ygagnon@xxxxxxxxxxxxx
- Date: Tue, 29 Jan 2002 18:16:44 +0000
Yannick,
This is exactly what Broadcom recommends for the
BCM5421S to reduce the clock input swing.
You can also explore using a clock driver like the
Motorola MPC9446 which will give you both 2.5V and 3.3V
clock outputs, with either 2.5v or 3.3v clock input.
Hope this helps.
Ellis
> Hello All,
>
> I have a clock signal that is generated by a clock buffer (pwr supply =
> 3.3V) and is sent to a
> device that is not 3.3V tolerant (pwr supply = 2.5V). The series termination
> is there to reduce
> the ringing and I have put a resistor R tide to the ground just before the
> input pin in order to
> reduce the signal to 2.5V.
>
>
> |>---/\/\/-----------------------------|>
> |
> [R]
> |
> |
> GND
>
> I did simulation in HSpice and it does what I want, the signal is reduced to
> 2.5V and the signal
> is clean, but from more experienced designers this practice is unusual.
>
> I was wondering if anybody had ever done this or something similiar.
> I would appreciate your feedbacks.
>
> Best regards,
>
> Yannick
>
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
