CD74HCT40105: EXPANSION, 8-BITS WIDE BY 16 N-BITS LONG USING.

Hi Hiroaki,

Hiroaki Yuyama TED said:

Is the direction of the arrow of MASTER RESET "MR" on page 12 of the data sheet reversed?

Yes the direction is reversed, the Master Reset MR is an input. 

Hiroaki Yuyama TED said:

For note 6 on page 13 of the data sheet, is it the section from the first rise of SI to the rise of DOR?

Yes

Hiroaki Yuyama TED said:

Also, is the SO signal invalid during this period?

When the FIFO is empty, DOR will remain LOW. The shift out signal will be invalid until a “1” marker ripples down to the last control register and DOR goes HIGH

Hiroaki Yuyama TED said:

For note 7 on page 13 of the data sheet, is it the section from the first fall of SO to the rise of DIR?

Yes

Hiroaki Yuyama TED said:

Also, is the SI signal invalid during this period?

The DIR flag will remain low when all 16-word locations are filled with valid data, so the shift in signal is invalid until the DIR flag goes high. 

Hiroaki Yuyama TED said:

Is it possible to write less than 16Word (for example, put one in and take out one)?

This device was not designed for this. 

Regards,

Sebastian