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I am interfacing 5V TTL logic to a 3.3v device. The 3.3v device is not 5V tolerant but does have internal clamping diodes. Is is safe to use those diodes as long as I have a series resistor to limit the current (datasheet says 20mA max)? Or is it better to use external diodes as long as they are...
I am trying to get a simple frequency multiplication scheme to work, but am having trouble getting the PLL to lock.
Background:I am sampling (frequency measurement) my signal at 1Hz, I can not sample any slower, and need to get a measurement resolution of 0.1Hz minimum. My input signal goes...
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