74AC datasheet, 74AC circuit, 74AC data sheet: FAIRCHILD – Quad Buffer with 3-STATE Outputs,alldatasheet, datasheet, Datasheet search site for. 74AC Quad Buffer With 3-STATE Outputs. The AC/ACT contains four independent non-inverting buffers with 3-STATE outputs.. Features. Order Number. See detailed ordering and shipping information in the package dimensions section on page 5 of this data sheet. ORDERING INFORMATION.
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For general setup questions, ‘how tos’, specifications and what-connects-to-what etc. Construction, mods and powering: Embedded Will this programmer fry 3. Looking to run an ATMegap at 3. And the data sheet for the RFM69W: So, this means I have both the RFM69W and the programmer hooked into the same rows on the breadboard. This programmer has a switch that toggles whether or not it should power the target with 5v – this will obviously be toggled off, as everything on the breadboard will be powered with some external 3.
Look at the schematic for your programmer. The “power target” switch exists for this purpose. If set to “no power,” then you can let your target board supply VCC ostensibly 3. Looks like you could cut the trace under JP1 and set the switch to “power target”.
Then the programmer would be completely powered by target. Then it would probably work fine down to 3. Would level shifting be a concern in this situation?
74AC datasheet & applicatoin notes – Datasheet Archive
With MrSurly’s theory, I’d be powering my circuit with external 3. Perhaps I’m misunderstanding your statement or the suggested solution. I’d be powering my circuit with external 3. By doing this you are only powering the buffer chip from 3. The rest of the programmer still runs at 5V. Thus if you power the buffer chip from your circuit the maximum allowable input voltage for it is 3.
74AC125 Datasheet PDF
To quote from the datasheet of the buffer chip: The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. To sum it up: The programmer appears to have a design flaw. Using it to dagasheet non-5V targets as intended by the designer might make it destroy itself. Got it – thanks for the clarification! Yeah, the guides are lacking. I imagine the switch disconnects the 5V USB but what do the data pins output?
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AskElectronics submitted 10 months ago by Tylerlee Want to add to the discussion? This is an intentional feature of the programmer, though it’s not well-documented. But really 74AC is a really poor choice for level shifting.