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SN74GTL2014: When ref is 0v, B side is 0v. vdd is 3.3v, A side has some oscillations.

Part Number: SN74GTL2014


Hi team,

My customer is using NXP GTL2014 now and meet weird phenomenon below. When ref is 0v, B side is 0v. vdd is 3.3v, A side has some oscillations. (the reason they give is The fundamental problem is that if the input comparator is powered by VDD, but the VREF and the Bn are both at zero and the direction is at zero the B to A path is enabled, but the inputs are equal with no noise margin, so the A output could be high, low, or oscillate. The fix is to add a comparator to the VREF and block the A output until the VREF is above some nonzero level)

We want to check whether our device is the same.

  

  • The SN74GTL2014 functional block diagram is the same. (And even has the same "002aab139" identifier, what a coincidence!)

    So the comparators will have the same problem.

    And 0 V is outside the recommended operating conditions for VREF, so this should be avoided in any case.