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LMP7701: Output clips for negative inputs

Part Number: LMP7701
Other Parts Discussed in Thread: LMP7702

Hi, I have half of an LMP7702 configured as a unity-gain buffer amp.  When the input signal gets to about -1.5 V, the output clips.  An LMP7701 in the same circuit has a 20-kohm feedback resistor, and its output clips at -0.75 V.   Supply voltages are ±6 V, and we see no dips on the  negative supply pin when the clipping occurs.  The load on each op amp is 20 kohms (with only trace capacitance).   I replaced the LMP7701 but saw the same behavior.  Any ideas?  Thanks.