[SI-LIST] Re: Level Shifter
- From: Paul Levin <levinpa@xxxxxxxxxxxxx>
- To: sunil bharadwaz <sunil_bharadwaz@xxxxxxxxx>
- Date: Mon, 25 Jan 2010 10:10:25 -0800
Dear Sunil,
You neglected to mention:
a) if there is some signal that would indicate the direction of data flow
on any bi-directional pins; and
b) how fast the data is.
Regards,
Paul Levin
consultant
_____________
sunil bharadwaz wrote:
> Hi ,
> I'am doing an application where a Microcontroller interacts with the rest of
> the digital
> circuitry working at 3.3 Volts (LVTTL).
>
> The Microcontroller can operate from 2.0 Volts to 3.6 Volts.
>
> The Supply to the Microcontroller can be any thing from 2.0 Volts to 3.6
> Volts , where
> as the rest of the circuitry operates at a fixed 3.3 Volts.
>
> There is a bi-directional data flow between the uc & rest of the digital
> logic.
>
> The max logic high I/P, the uc can tolerate is 2.5 Volts , when operated at
> 2.0 Volts supply (Supply + 0.5 Volts).The logic high O/P of the rest of the
> circuitry is at almost 3.3 Volts.We require a level shifter to bring down the
> level of this signal which is I/P to uc.
>
> Similarly , the VIH of the rest of circuitry is 2.0 Volts.The VOH of uc at
> 2.0 Volts supply
> is only about 1.8 Volts or less.This requires a level shifter to shift to a
> higher level.
>
> The problem here is a variable supply to uc , which can be any value from
> 2.0 Volts
> to 3.6 Volts.
>
> Pls suggest a proper level shifter here.Are there any bi-directional level
> shifters for
> these types of applications ?
>
> Thanks in Advance !!
>
> Regards
> Sunil.B
>
>
>
>
>
>
>
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