How many sets of I/V data should I have in an IBIS model if the I/O buffer is an open-drain buffer?

Description

Open-drain or open-collector buffers only require three sets of I/V data, which are [Pulldown], [GND Clamp] and [POWER Clamp]. [Pullup] data can be omitted since the current data in the [Pullup] table are all zeros.

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