I have a question about SN74LV245A.
Data Sheet SN54LV245A, SN74LV245A SCLS3820-SEPTEMBER 1997-REVISED SEPTEMBER 2014 has the following description.
7.1 Absolute Maximum Ratings
Vi input voltage range Except I/O port(2) MIN -0.5V MAX 7V
i/o ports(2)(3) MIN -0.5V MAX 7V
(2)The input and output negative-voltage rating may be exceeded if the input and output current rating are observed.
(3)This value is limited 5.5V maximum.
・Is (3) necessary for [I / O port (2) (3)]? Why is it necessary?
According to Application Report SZZA036C-December 2002-Revised June 2016,
if there are no clamp diodes between the device inputs and the Vcc supply,
the positive absolute maximum rating is a limitation of the process technology and is specified as an absolute voltage.
The TI logic families without clamp diodes in the inputs are ABT, ABTE,－－LV, LVC,－－ SSTV, and VME.