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'[EE] 3.3v-5v level shifter/transceiver in DIP pac'
2003\07\19@105759 by Jean-Michel Howland

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>I'm looking for a level-shifter (3.3v-5v), preferably a transceiver, that I
>could use to interface between a PIC and a MMC card. Since I'm prototyping
>on a breadboard though, it must be a DIP --- I looked around, but couldn't
>find any that were. Any ideas on where to look?


I think you're out of luck wanting DIP.  My current project uses
SN74LVC4245A octal transceivers to do this and they only seem to come as SM
devices.  Mind you it wouldn't be hard to make a 24 TSSOP/SSOP/SOIC to DIP
adaptor.

Check out TI for free samples and also take a look at the SN74LVC3245
parts, they are functionally the same as the 4245 but the control signals
operate at the 3.3v level instead of 5v.

Regards
Jean-Michel.

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2003\07\19@112334 by Anand Dhuru

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How about operating the PIC on 3.3 volts as well?

Regards,

Anand Dhuru


----- Original Message -----
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Sent: Saturday, July 19, 2003 6:45 PM
Subject: [EE] 3.3v-5v level shifter/transceiver in DIP packaging?


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2003\07\19@115629 by Ishaan Dalal

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> How about operating the PIC on 3.3 volts as well?

Can't; PIC is emulating a DDS at 39.0625 KHz (40 Mhz/4/256), and the 18LFs
do 40 MHz at 4.2V, but go down from then.

Anyway, I found the SN74LVC245AN (PDIP) from TI, that handles over-voltage
I/O at Vcc=3.3V, so I should be all set... :-)

Cheers,
Ishaan

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2003\07\19@154649 by Picdude

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How many interface lines do you need?  Can't you use simple transistor switches for this?  And you should be able to get transistor arrays in DIP packaging.

Cheers,
-Neil.


On Saturday 19 July 2003 10:23, Anand Dhuru scribbled:
> How about operating the PIC on 3.3 volts as well?
>
> Regards,
>
> Anand Dhuru
>
>
> {Original Message removed}

2003\07\19@162513 by Ishaan Dalal

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> How many interface lines do you need?  Can't you use simple transistor
> switches for this?  And you should be able to get transistor arrays in DIP
> packaging.

Five. Since none need to be bidirectional, I imagine I could use a
transistor array. I could also just use a '244 buffer instead of the '245
transceiver I thought of earlier. Let's see...

Cheers,
Ishaan

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2003\07\19@162934 by Bob Axtell

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I'm doing an MMC right now.

I've decided on using an 74LVX244. Its available in DIP, too.  It can
tolerate 5V inputs for a 3.3V output. The 3.3V regulator only drives the
74LVX244. I parallelled 4 unused outputs to drive the MMC card and its
pullups.

--Bob


At 09:15 AM 7/19/2003 -0400, you wrote:
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2003\07\19@164830 by Ishaan Dalal

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> I'm doing an MMC right now.

SPI, or the MMC protocol?

> I've decided on using an 74LVX244. Its available in DIP, too.

Which manufacturer? Couldn't find a DIP variant in either the Fairchild or
ST LVX244 lineups. I'll probably stick to TI's 74LV244AN.

Cheers,
Ishaan

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2003\07\19@185834 by Bob Axtell

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SPI. I'm not moving data fast, cheap is what I need.

You might be right about the LVX244, only SM.

--Bob

At 04:49 PM 7/19/2003 -0400, you wrote:
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