Question about port exander NXP PCF8574P

How do you tel from the numbers of the IC whether you have the DGV / PW or DW / N package?

Isn't that in the datasheet?
do you have a link to it?

robtillaart:
Isn't that in the datasheet?
do you have a link to it?

I got those designations from the datasheet.
But I can't see any of those designations on the chip so I am none the wiser as to which pin configuration it is

http://www.ti.com/lit/ds/symlink/pcf8574.pdf Page 3 TOP

DGV / PW ==> 20 pins DIP
DW / N ===> 16 pins DIP

  • page23 contains order information

So I’ve been doing it wrong all these years? I’ve always just counted the pins. /sarc

avr_fred:
So I’ve been doing it wrong all these years? I’ve always just counted the pins. /sarc

Oh fuc# :confused:

Didn’t notice that one type had two extra pins. I have the DW/N type.

Probably would have been scratching my head for a month if one of you had not pointed out the bleeding obvious.