Re: [ts-7000] 3.3V 5V ideas

Try using any 5V open collector gate  with it's output pulled up to 3.3V. You don't need any fancy bus transceiver to do what you're doing.

--- On Wed, 12/16/09, craignied <> wrote:

From: craignied <>
Subject: [ts-7000] 3.3V 5V ideas
To:
Date: Wednesday, December 16, 2009, 3:34 PM

 

Hi gurus,

I'd like to use the GPIO lines of the processor, and have read the warnings about applying 5V logic levels to 3.3V logic levels. Sounds dangerous :)

I need both to drive 5V TTL devices as well as get input from 5V TTL devices. I've been reading a little, and was curious what you all thought.

What I found was a Texas Instruments IC, SN74LVC4245A OCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTER (http://www.ti. com/lit/gpn/ SN74LVC4245A) which seems to do the job. Unfortunately, it's a 24 pin surface mount, and I don't have access to high end breadboarding equipment for surface mount devices. A DIP does not seem to be available. Low end breadboarding solutions like the surfboard (http://www.capitala dvanced.com/ products. htm) seem to only go up to 20 pins.

Questions:
1. What are people using to convert 5V TTL to 3.3V and vice versa?
2. Does anyone have a relatively inexpensive solution for breadboarding surface mount components?

Many TIA,
Craig

__._,_.___

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: =Email Delivery: Digest | m("yahoogroups.com?subject","ts-7000-fullfeatured");=Change Delivery Format: Fully Featured">Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | =Unsubscribe

__,_._,___