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Hello Jan, Thank you for fast answer. However, using the 74HCT solved the problem. I've not found any datasheet of the 74HCF The CMOS switches have much higher switch-on resistance what is causing timing problems. Jan Dne Check out the most recent posts - join the conversation now.
I have original PCBs the same as these presented on project webpage. No communication problems, even with a 5m long cable. But it doesn't work with USB interface. I started to get very deeply into the whole thing, even looked into the source code, learned the EEP protocol basics, looked at the waveforms on the oscilloscope. This problem made me mad :. It looks like the USB interface works on the edge.
Sometimes, every few seconds application gets a proper reading of firmware version from the device. I seems that as the result, device and PC doesn't latch the proper value of data bits. I'm going to order some different versions of multiplexer and then compare the results, maybe a little faster IC will make it work without problems.
I'm not sure if there are any important timing differences between HC. Or maybe a problem is somewhere else. Did anyone have similiar problems with USB interface? Hello, your observation about the timing on the edge is correct.
TRIPLE 2 CHANNLE ANALOG MULTIPLEXERS DEMULTIPLEXERS
OVER 15V p. When a logic "1" is present at the inhibit input terminal all channel are off. This device is a triple 2-channel multiplexer having three separate digital control inputs, A, B, and C, and an inhibit input. Each control input selects one of a pair of channels which are connected in a single pole double-throw configuration. Absolute Maximum Ratings are those values beyond which damage to the device may occur.
HCF4053 datasheet pdf datenblatt
HCF4053 Data Sheet PDF
Datasheet Texas Instruments UC3843D