[SI-LIST] Re: Bi directional Level Shifters
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 05 Sep 2012 02:11:44 -0700
http://www.ti.com/lit/ds/symlink/sn74cbtd3384c.pdf
On 9/5/2012 1:57 AM, Muhamed Semic wrote:
> I would like to pose quick question, will it be possible to use "
> SN74CBTD3384CPW" for translating signals from 3v3 to 0v8 circuits.
>
> Regards,
> M. Semic
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of Rick Collins
> Sent: 04 September 2012 19:30
> To: SI LIST
> Subject: [SI-LIST] Re: Bi directional Level Shifters
>
> I don't know much about the TXB parts, but I think the OP might do better
> with Quick Switch parts. I have used the SN74CBTD3384CPW to connect 5 volt
> circuits to 3 volt circuits which might work for 3.3 volt to 1.8 volt
> circuits. These are only rated for 4.5 to 5.5 volt Vcc, but maybe there are
> similar parts for lower voltages. The big advantage is the speed, Tpd of
> 0.15 ns max. Ten/Tdis is 4.8 ns max. The TXB part with Vcca of 1.8 volts
> and Vccb of 3.3 volts has a Tpd of around 7 ns. The Ten is a whopping 1 us!
> Yes, that's microsecond. But I expect that doesn't matter in this case.
>
> The QuickSwitch parts use a diode to drop Vcc which then powers the gate on a
> pass transistor. Combined with the gate voltage this prevents a higher
> voltage on the data pins from being passed through. Since the data path is
> through the already turned on channel, there is very little delay. The data
> doesn't deal with the turn on/off delay of transistors. There are versions
> that come in rather high pin count packages, but I think the smaller TSSOP
> package uses the smallest board space per channel.
>
> Like someone said, TI is very big in this area, check out their web page.
> They have a good selection guide too.
>
> Rick
>
>
> At 10:56 AM 9/4/2012, Thompson, Gary D (Gary) wrote:
>> I've use the TI TXB0108's regularly for this type of application.
>>
>>
>> Gary Thompson
>> LSI Corp.
>>
>>
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