N8234N datasheet

[Eric Smith]

Joe wrote:
>   Does anyone have a datasheet for these? I THINK they're Quad 2 input
> multiplexers but I'm not sure. I found them in an i8008 computer system.

Yes.  They're a bit unusual as they have two select inputs.  It's the
inverting open-collector version of the 8233, so you can get the
complements of the A or B inputs, or 1.

       -----U-----
    A0 | 1    16 | Vcc
    B0 | 2    15 | A3
    f0 | 3    14 | B3
    f1 | 4    13 | f3
    B1 | 5    12 | f2
    A1 | 6    11 | B2
    S1 | 7    10 | A2
   GND | 8     9 | S0
       -----------


Truth table:


               8233/
               82S33   8234/
               (totem  82S34    8235
               pole)   (open collector)
   S0    S1     fn       fn      fn
  ----  ----   -----   -----    -------
    0     0      B       /B     /A * B
    0     1      B       /B        B
    1     0      A       /A       /A
    1     1      0       1         1