Any other chips this sensitive to ESD?

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cupoftea

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Of course it may not be CMOS at all.
When "limited ESD protection" is written it usually means a pin can withstand voltages higher than its supply voltage. In other words there is nowhere for input clamp diodes to conduct to. It is quite common in 1.8/3.3V powered MCU when they have 5V tolerant input pins and the usual protection diodes are omitted. It is less common in other devices but probably for the same reason.

Brian.
 

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Not surprising to me. Many old bipolar linear had no designed ESD protection at all. I once worked on a RF SOI mixer (FET-quad) that had none, and a 10V (yes) ESD failure threshold.
 

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