Do any of the digital isolators have TTL threshold levels?
Chris: Yes, the standard 4 channel digital isolators, ADuM140x, 141x, 240x, 340x all have TTL input levels. The isoPower ADuM540x, 520x, 640x and the new ADuM347x all have CMOS inputs, since they are power supply applications and CMOS inputs have higher levels for better input noise immunity. The 2 channel digital isolators also have CMOS input levels since they are sometimes used as isolators in gate applications where higher noise immunity is important.
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