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