3.3 to 5 volt interface

NO IT IS NOT! Even a CMOS 5V input requires no more than 5 x(0.7-0.3)=2Vpp for guaranteed operation, and you have probably 3Vpp. Bias the 5V input at 5V/2 DC, with a resistor divider, and ac-couple the clock into it, with a capacitor.

Transistor? If you don't mind inverting the clock. Else, two transistors. Total cost, about $0.30.

How about a SN74LVC1G06 ? It's a single open drain buffer in sot-23 or sot-323 packaging, runs on 3.3v or 5v Vcc, and accepts either 3.3v or

"newinwa" schrieb im Newsbeitrag news:44e32191$0$11970$ snipped-for-privacy@news.optusnet.com.au...

DC--DC step-up converter, maybe? (Not sure if I read the whole question.)

Use a pull-up resistor at the input and a diode between the two devices (anode to input of driven device and cathode to output of driving device).

HS

If the 5V device has TTL input thresholds, you don't have to do anything. For instance, a 3.3V device can drive a 74ACTxxx directly. If you can't pick the 5 V device, use a 74ACT32 as a buffer.

Tam

Thanks for the diode idea ..I was thinking about that one today. Have to be a pretty fast diode tho...

I have ZLL400 that might do...I'll try that

The thresholds are Vih=3.5V Vil=1. The 3.3 oscillator works but is out of spec...and not available in 5 volt (its spread spectrum)

thanks again for your thoughts

Typical- the nitwit zeroes in on the most wholly out-of-spec and worthless "solution."

Typical - the twit dishes out sarcastic criticism without any hint of help.

I have learned that people do best what they feel they are most capable of.

Yeah- and in your case that is absolutely NOTHING! You're a goddammed loudmouth heckling from the bleachers as usual. *I* already told him to use ac-coupling. Where is your post, you fat-faced lethargic pos?

Q.E.D.

Is that the best you can do? Think so. You avoided answering where your post is because there was none. You're a typical spectator leach. Maybe you're that same passive-aggressive flake "Bob Monsen"- whatever, take a hike.

You can be assured that my ability in your chosen field will always pale beside yours. Since my advice or examples will always be useless to you or to anyone who feels that your inputs are of value, then you should ignore me forever. Plonk me now!

Is that passive-aggressive enough for you?

Were you able to read between the lines?

You really have a certain gelatinous and spineless way of communicating, very much in keeping with your character , or lack thereof. You refuse to answer any questions put to you, because you are a sham of a man, and you refuse to acknowledge that your initial criticism of my participation in the thread was dead wrong, and actually more applicable to the likes of you. Somewhere along the way someone mislead you into believing your ideas, opinions, and say in matters was important. Whoever did that was either deceiving you or starved for babble. Why don't you go loiter down by the fountain at the mall like a good little retiree.

Sorry, not retired yet.

The reason I didn't reply with advice was that the method I would have suggested had already been presented. There were several excellent suggestion, most of them better than yours.