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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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This is really proving problematic. Could a tiny bit of ringing on the line upset the device?

MCP3551 – Odd results?

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

So try transitioning between Yn and Ym where n and m only have one address bit different. CS is driven through a HC decoder. Sometimes a conversation with someone knowledgeable just frees up the brain a bit!

Until I crack this, I’m stymied.


Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond Thanks again for dagasheet 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! Why does my PIC32 run slower than expected? That should be glitch free and will do for testing. Also, I see in one app note schematic, a 1K resistor in each digital line.

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.

User Control Panel Log out. Thanks for your help.

MCP – Odd results? | Microchip

It must be in the datasheet. Hey – that’s an interesting thought. Is this a clue? I have made some progress. The tcsl on the datasheet is ch138 so does that mean any glitch shorter than 50ns won’t have any effect? This is the scenario: However, I notice in trawling for source code, datxsheet an example from Microchip applies a 1ms low-going pulse to the CS. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs.


M Super Member Vatasheet Posts: Therefore, it needs to be. Maybe it’s a footnote in the datasheet. Forums Posts Latest Posts. It seems unlikely but it would explain the random nature of the results. I get odd results. Microchip are usually pretty thorough.

HC138 Datasheet

I’m now back to the first code but with a small adjustment. It does seem to require a 1ms start pulse.

Essentials Only Full Version. The waveforms are perfect.

HC Datasheet(PDF) – System Logic Semiconductor

I cannot see anywhere where I have broken any rules. Haven’t received registration validation E-mail? Moreover, even if there is a splurge on the falling edge, it shouldn’t have any further effect