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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MCP3551 – Odd results?

It must be in the datasheet. Maybe it’s a footnote in the datasheet. But I’ve read it and read it and I cannot see anything that would tell me. Sometimes a conversation with datassheet knowledgeable just frees up the brain a bit! Any help gratefully received. Microchip are usually pretty thorough. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs.

I then read SDO to see if a conversion is ready. Thanks for your help. 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!


The waveforms are perfect. Forums Posts Latest Posts. This is the scenario: Why does my PIC32 run slower than expected? What language is your source in? Please bear in mind that I have been tinkering with the code for several days and have tried many variations.

M Super Member Total Posts: This is a best guess: By coincidence, I am transitioning with one bit change only. I’m off glitch hunting. I have made some progress.

That should be glitch free and will do for testing. Until I crack this, I’m stymied. I get odd results. CS is driven through a HC decoder. It seems unlikely but it would explain the random nature of the results. Forum Themes Elegant Mobile. It’s bound to be some devilish little detail confounding me.

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. If it is, I clock the result out. Moreover, even if there is a splurge on the falling edge, it shouldn’t have any further effect Datasehet breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond It does seem to require a 1ms start pulse.

HC138 Datasheet

Therefore, it needs to be. I don’t know why this should be. And so seems to be the case.


I take your point about the but there is one bit of exculpatory evidence: Haven’t received registration validation E-mail? Meanwhile, thanks for your suggestion. I cannot see anywhere where I have broken any rules.

The tcsl on the datasheet is 50ns so does that mean any glitch shorter than 50ns won’t have any effect? Thanks again eatasheet your help!

Could a tiny bit of ringing on the line upset the device? Changing the address pins with the enables strapped active is likely to cause glitches. Hey – that’s an interesting thought. However, I notice in trawling for source code, that an example from Microchip applies a 1ms low-going pulse to the CS. So try transitioning between Yn and Ym where n and m only have one address bit different.

HC Datasheet(PDF) – System Logic Semiconductor

I’m now back to the first code but with a small adjustment. Also, I see in one app note schematic, a 1K resistor in each digital line. This is really proving problematic. Essentials Only Full Version. Is this a clue? MCP – Odd results?