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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I take your point about the but there is one bit of exculpatory evidence: Maybe it’s a footnote in the datasheet. CS is driven through a HC decoder. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs. User Control Panel Log datashret.

HC138 Datasheet

Sometimes a conversation with someone knowledgeable just frees up the brain a bit! This is a best guess: Could a tiny bit of ringing on the line upset the device? This is really proving problematic. M Super Member Total Posts: I get odd results. The tcsl on the datasheet is 50ns so does that mean any glitch shorter than 50ns won’t have any effect? If not, I set CS high and do other stuff until the next time, assuming that polling CS either does nothing if dataasheet the middle of a conversion or initiates a new conversion.


Why does my PIC32 run slower than expected? Forums Posts Latest Posts. I cannot see anywhere datasehet I have broken any rules.

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

SLS HC Series Datasheets. SL74HC, HC Datasheet.

Thanks again 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!

I have made some progress. I don’t know why this should be. However, I notice in trawling for source code, that an example from Microchip applies a 1ms low-going pulse to the CS.

Haven’t received registration validation E-mail? MCP – Odd results?

I’m off glitch hunting. Is this a clue? Essentials Only Full Version. Hey – that’s an interesting thought.

MCP3551 – Odd results?

Until I crack this, I’m stymied. Forum Themes Elegant Mobile.

Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond Please bear in mind that I have been tinkering with the code for several days and have tried many variations. And so seems to be the case. This is the scenario: Also, I see in one app note schematic, a 1K resistor in each digital line.


Microchip are usually pretty thorough. Moreover, even if there is a splurge on the falling edge, it shouldn’t have any further effect By coincidence, I am transitioning with one bit change only.

It seems unlikely but it would explain the random nature of the results. The waveforms are perfect. Any help gratefully received. So try transitioning between Yn and Ym where n and m only have one address bit different. It must be in the datasheet.

It’s bound to be some devilish little detail confounding me. Thanks for your help.

MCP – Odd results? | Microchip

I then read SDO to see if a conversion is ready. Changing the address pins with the enables strapped active is likely to cause glitches. If it is, I clock the result out. That should be glitch free and will do for testing.

Therefore, it needs to be. I’m now back to the first code but with a small adjustment. What language is your source in? dstasheet

Meanwhile, thanks for your suggestion.