Product data sheet. 1 General description. The 74HC; 74HCT decodes three binary weighted address inputs. (A0, A1 and A2) to eight. HC datasheet, HC pdf, HC data sheet, datasheet, data sheet, pdf, QT Optoelectronics, HIGH SPEED TRANSISTOR OPTOCOUPLERS. HC 1-of-8 Decoder/demultiplexer. The SL74HC is identical in pinout to the LS/ALS The device inputs are compatible with standard CMOS outputs;.

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Maybe it’s a footnote in the datasheet. MCP – Odd results? I’m off glitch hunting.

What language is your source in? I’m going wrong somewhere but there has to be a limit to how many times I can read the datasheet before mental atrophy sets in! It does seem to require a 1ms start pulse.

Hey – that’s an interesting thought. I cannot see anywhere where I have broken any rules. But I’ve read it and read it and I cannot see anything that would tell me.

MCP – Odd results? | Microchip

This is really proving problematic. Please bear in mind that I have been tinkering with the code for several days and have tried many variations.

I’m now back to the first code but with a small adjustment. Could a tiny bit of ringing on the line upset the device? Sometimes a conversation with someone knowledgeable just frees up the brain a bit! I have made some progress. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs.


By coincidence, I am transitioning with one bit change only. Also, I see in one app note schematic, a 1K resistor in each digital line. It’s bound to be some devilish little detail datsaheet me. Changing the address pins with the enables strapped active is likely to cause glitches. The waveforms are perfect. Thanks again for your help!

Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond If it is, I clock the result out.

HC138 Datasheet

It seems unlikely but it would explain the random nature of the results. CS is driven through a HC decoder. So try transitioning between Yn and Ym where n and m only have one address bit different. Forums Posts Latest Posts. Is this a clue?

User Control Panel Log datawheet. Therefore, it needs to be.

MCP3551 – Odd results?

Moreover, even if there is a splurge on the falling edge, it shouldn’t have any further effect It must be in the datasheet. That should be datasheeet free and will do for testing. And so seems to be dataeheet case. Any help gratefully received. Haven’t received registration validation E-mail? However, I notice in trawling for source code, that an example from Microchip applies a 1ms low-going hd138 to the CS.


I take your point about the but there is one bit of exculpatory evidence: This is the scenario: If not, I set CS high and do other stuff until the next time, assuming that polling CS either does nothing if in the middle of a conversion or initiates a new conversion. M Super Member Total Posts: I then read SDO to see if a conversion is ready.

Until I crack this, I’m stymied.

Thanks for your help. Essentials Only Full Version. Datassheet are usually pretty thorough. I don’t know why this should be.

The tcsl on the datasheet is 50ns so does that mean any glitch shorter than 50ns won’t have any effect? This is a best guess: I get odd results. Why does my PIC32 run slower than expected? Forum Themes Elegant Mobile. Meanwhile, thanks for your suggestion.