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Hageman, Steve. "Digital-I/O circuit adapts to many interface voltages.(design ideas)." EDN Asia. Canon Communications L.L.C. 2007. HighBeam Research. 19 Apr. 2018 <https://www.highbeam.com>.
Hageman, Steve. "Digital-I/O circuit adapts to many interface voltages.(design ideas)." EDN Asia. 2007. HighBeam Research. (April 19, 2018). https://www.highbeam.com/doc/1G1-169086297.html
Hageman, Steve. "Digital-I/O circuit adapts to many interface voltages.(design ideas)." EDN Asia. Canon Communications L.L.C. 2007. Retrieved April 19, 2018 from HighBeam Research: https://www.highbeam.com/doc/1G1-169086297.html
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To test products in my R&D lab, I build many universal data-acquisition systems that connect to a PC or another controller through RS-232 links or LANs. These small systems typically include multiple ADC, DAC, and digital-I/O channels to control various hardware functions during product design and development. Over the years, I have established a simplified analog-interface standard that spans a 0 to 5V range. On the digital side, many of the newer logic families no longer tolerate 5V inputs and have rendered 5V-only digital-I/O ports obsolescent.
To solve the problem, I designed a flexible digital-interface circuit around a MAX7301 I/O expander from Maxim Integrated Products (www. …
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