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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Therefore, it needs to be.

HC 데이터시트(PDF) – QT Optoelectronics

Thanks for your help. Please bear in mind that I have been tinkering with the code for several days and have tried many variations. Hey – that’s an interesting thought. 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. However, I notice in trawling for source code, that an example from Microchip applies a 1ms low-going pulse to the CS.


I’m off glitch hunting. Meanwhile, thanks for your suggestion. I’m now back to the first code but with a small adjustment. If it is, I clock the result out.

What language is your source in? Also, I see in one app note schematic, a 1K resistor in each digital line. This is a best guess: This is really proving problematic. Is this a clue? It’s bound to be some devilish little detail confounding me.

Any help gratefully received. Haven’t received registration validation E-mail?

MCP – Odd results? Forum Themes Elegant Mobile. Debug breakpoints automatically disabled 16F88 cannot dataxheet internal oscillator frequency beyond So try transitioning between Yn and Ym where n and m only have one address bit different.

This is the scenario: Forums Posts Latest Posts. I have made some progress.

MCP3551 – Odd results?

But I’ve read it and read it and I cannot see anything that would tell me. 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! I get odd results. It does seem to require a 1ms start pulse.


Microchip are usually pretty thorough. It seems unlikely but it would explain the random nature of the results. Sometimes a conversation with someone knowledgeable just frees up the brain a bit! The waveforms are perfect. That should datxsheet glitch free and will do for testing. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs.

I don’t know why this should be.

Until I crack this, I’m stymied. Essentials Only Full Version. I then read SDO to see if a conversion is ready. I take your point about the but there is one bit of exculpatory evidence: It must be in the datasheet.

User Control Panel Log out. Changing the address pins with the enables strapped active is likely to cause glitches. Could a tiny bit of ringing on the line upset the device?