op amp inputs


for example, LM324
http://www.st.com/stonline/books/pdf/docs/4797.pdf
the data *** states a differential voltage of as much as 32 volts is
permissible.
But in the diagram it looks like at about 15 or 20 volts input
differential the b/e junctions on one of the inputs would go into
reverse conduction.
Do I misunderstand or do they use protection circuitry not shown in
the diagram.

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