HC138 DATASHEET PDF

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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: Changing the address pins with the enables strapped active is likely to cause glitches.

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.

Is this a datasheeet Forums Posts Latest Posts. I cannot see anywhere where I have broken any rules. M Super Member Total Posts: I have made some progress. Moreover, even if there is a splurge on the falling edge, it shouldn’t h1c38 any further effect Maybe it’s a footnote in the datasheet. By coincidence, I am transitioning with one bit change only.

But I’ve read it and read it and Datashee cannot see anything that would tell me. It seems unlikely but it would explain the random nature of the results. Essentials Only Full Version.

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User Control Panel Log out. Thanks again for your help! This is a best guess: It must be in the datasheet. Haven’t received registration validation E-mail? Microchip are usually pretty thorough.

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’m off glitch hunting. Thanks for your help. If it is, I clock the result out. This is really proving problematic. Datadheet, it needs to be.

Sometimes a conversation with someone datashert just frees up the brain a bit! What language is your source in? I’m now back to the first code but with a small adjustment.

And so seems to be the case. Meanwhile, thanks for your suggestion.

MCP3551 – Odd results?

Hey – datashest an interesting thought. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs. It does seem to require a 1ms start pulse. I then read SDO to see if a conversion is ready. Please bear in mind that I have been tinkering with datassheet code for several days and have tried many variations.

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Could a tiny bit of ringing on the line upset the device?

I get odd results. Until I crack this, I’m stymied. 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. Why does my PIC32 run slower than expected?

The waveforms are perfect. This is the scenario: Any datasyeet gratefully received. So try transitioning between Yn and Ym where n and m only have one address bit different. MCP – Odd results? That should be glitch free and will do for testing.

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Also, I see in one app note schematic, a 1K resistor in each digital line. CS is driven through a HC decoder. It’s bound to be some devilish little detail confounding me. I don’t know why this should be. Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond The tcsl on the datasheet is 50ns so does that mean any glitch shorter than 50ns won’t have any effect?