HI-8591 Datasheet, Holt Integrated Circuits

! ! ! ! ! ! ! FUNCTION TABLE RINA -1.25V to 1.25V -3.25V to -6.5V 3.25V to 6.5V X X RINB -1.25V to 1.25V 3.25V to 6.5V -3.25V to -6.5V X X X TESTA 0 0 0 0 1 1 TESTB 0 0.

where lightning protection is a requirement. After level translation, the inputs are buffered and become inputs to a dif.