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’s bound to be some devilish little detail confounding me. I cannot see anywhere where I have broken any rules. Thanks again for your help! I don’t know why this should be. CS is driven through a HC decoder. Please bear in mind that I have been tinkering with the code for several days and have tried many variations.
I’m off glitch hunting. Microchip are usually pretty thorough. It does seem to require a 1ms start pulse. This is really proving problematic. I have made some progress.
Meanwhile, thanks for your suggestion. I then read SDO to see if a conversion is ready. It seems unlikely but it would explain the random nature of the results. 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.
Forum Themes Elegant Mobile. M Super Member Total Posts: If it is, I clock the result out. It must be in the datasheet. This is a best guess: Moreover, even if there is a splurge on the falling edge, it shouldn’t have any further effect Why does my PIC32 run slower than expected? Could a tiny bit of ringing on the line upset the device?
But I’ve read it and read it and I cannot see anything that would tell me.
However, I notice in trawling for source code, that an example from Microchip applies a 1ms low-going pulse to the CS. Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond Dtasheet tcsl on the datasheet hc183 50ns so does that mean any glitch shorter than 50ns won’t have any effect?
Is this a clue? So try transitioning between Yn and Ym where n and m only have one address bit different.
I get odd results. Therefore, it needs to be. Sometimes a conversation with someone knowledgeable just frees up the brain a bit! MCP – Odd results? Maybe it’s a footnote in the datasheet. Haven’t received registration validation E-mail?
HC Datasheet pdf – HIGH SPEED TRANSISTOR OPTOCOUPLERS – QT Optoelectronics
Essentials Only Full Version. 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! By coincidence, I am transitioning with one bit change only. Thanks for datassheet help. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs.
Forums Posts Latest Posts. That should be glitch free and will do for testing. What language is your source in? Any help dahasheet received. And so seems to be the case. I’m now back to the first code but with a small adjustment. This is the scenario: Until I crack this, I’m stymied. The waveforms are perfect.
Changing the address pins with the enables strapped active is likely to xatasheet glitches. Hey – that’s an interesting thought. Also, I see in one app note schematic, a 1K resistor in each digital line. I take your point about the but there is one bit of exculpatory evidence: User Control Panel Log out.