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81142A into 1.2V CMOS?

Question asked by dfrebrowski on May 5, 2011
Latest reply on May 6, 2011 by lhornburg
I would like to supply serial data directly to a CMOS chip from an 81142A pulse data generator. The chip expects Vlow = 0 and Vhigh=1.2V.

I have read through the manual which describes the protection algorithms applied to ports which are not connected, and that if an improper impedance (not 50 ohms) is detected then the voltage is automatically set to a safe level for the instrument. I also noticed that none of the available preset logic families listed in the user guide apply to my device. Given that my device will not show anything close to 50 ohms to the generator port, can I expect to give this instrument to give me the voltages I want, or will the instrument see too-high impedance and kick in the protection? Furthermore, how far away from 50 ohms is "too far" is not made clear in the user guide, unless I'm missing something.

Thanks in advance.