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’m off glitch hunting.

Thanks for your help. If it is, I clock the result out. I then read SDO to see if a conversion is ready. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs. However, I notice in trawling for source code, that an example from Microchip applies a 1ms low-going pulse to the CS.

Bilkent University Electrical and Electronics Engineering

Sometimes a conversation with someone knowledgeable just frees up the brain a bit! And so seems to be the case. By coincidence, I am transitioning with one bit change only.


Microchip are usually pretty thorough. Changing the address pins with the enables strapped active is likely to cause glitches.

HC138 Datasheet

Forums Posts Latest Posts. It does seem to require a datasheer start pulse. Haven’t received registration validation E-mail? Hey – that’s an interesting thought.

MCP3551 – Odd results?

M Super Member Total Posts: Maybe it’s a footnote in the datasheet. I’m now back to the first code but with a small adjustment. Moreover, even if there is a splurge on the falling edge, it shouldn’t have any further effect Any help gratefully received. Please bear in mind datashset I have been tinkering with the code for several days and have tried many variations.

I cannot see anywhere where I have broken any rules. Therefore, it needs to be. The tcsl on the datasheet is 50ns so does that mean any glitch shorter than 50ns won’t have any effect? It seems unlikely but it would explain the random nature of the results.

HC Datasheet PDF – Texas Instruments

What language is your source in? It must be in the datasheet. 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. That should be glitch free and will do for testing. I have made some progress.


Meanwhile, thanks for your suggestion. It’s bound to be some devilish little detail confounding me.

Datasneet waveforms are perfect. This is really proving problematic. Essentials Only Full Version. I daatasheet your point about the but there is one bit of exculpatory evidence: Why does my PIC32 run slower than expected?

Thanks again for your help! MCP – Odd results? 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! But I’ve read it and read it and I cannot see anything that would tell me. I get odd results.

CS is driven through a HC decoder. This is the scenario: