Hi to everybody.
I've found the problem... my mistake. I have wired up in the opposite way the Serial In and Serial out terminal of the chip. Shame on me.
@longpole001, if you are searching for the datasheet of the 23LVC1025, then get the one attached to this message.

Datasheet Microchip SRAM 23LCV1024 - 128K_x_8.pdf

Best regards.