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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And so seems to be the case. Any help gratefully received. MCP – Odd results?

It’s bound to be some devilish little detail confounding me. User Control Panel Datashedt out. Forum Themes Elegant Mobile. This is the scenario: Please bear in mind that I have been tinkering with the code for several days and have tried many variations.

SLS HC Series Datasheets. SL74HC, HC Datasheet.

Essentials Only Full Version. The tcsl on the datasheet is 50ns so does that mean any glitch shorter than 50ns won’t have any effect? This is really proving problematic.

  EN 13411-1 PDF

That datasheeh be glitch free and will do for testing.

But I’ve read it and read it and I cannot see anything that would tell me. Haven’t received registration validation E-mail? Why does my PIC32 run slower than jc138 I get odd results. The transitions from Y0 being active to Yn being active so any glitches ought to appear on the other outputs. Also, I see in one app note schematic, a 1K resistor in each digital line.

HC138 Datasheet

I’m off glitch hunting. If it is, I clock the result out. So try transitioning between Yn and Ym where n and m only have one address bit different. Microchip are usually pretty thorough. Dafasheet does seem to require a 1ms start pulse.

By coincidence, I am transitioning with one bit change only. Bc138 I crack this, I’m stymied. I don’t know why this should be. Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond Meanwhile, thanks for your suggestion.


This is a best guess: CS is driven through a HC decoder.

I take your point about the but there is one bit of exculpatory evidence: I’m now back to the first code but with a small adjustment. It must be in the datasheet. Therefore, it needs to be. Moreover, even if datashewt is a splurge on the falling edge, it shouldn’t have any further effect However, I notice in trawling for source datasehet, that an example from Microchip applies a 1ms low-going pulse to the CS.

Thanks again for your help!

Hey – that’s an interesting thought. Could a tiny bit of ringing on the line upset the device?

I’m going wrong somewhere but there has h1c38 be a limit to how many times I can read the datasheet before mental atrophy sets in! Is this a clue? What language is your source in?