Hi, Michael.
As long as 3out and 4out move with the 3a/b and 4a/b designation, there should be no difficulty. In other words, it doesn't matter whether the gate is called 3 or 4; if the corresponding output still corresponds, not problems.
HTH,
Donald.
----- Original Message -----
From: "michael tenore" <wb2lcw@...>
To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
Sent: Saturday, May 16, 2009 8:35:40 PM GMT -05:00 US/Canada Eastern
Subject: [Homebrew_PCBs] 74LS157 pinouts?
I was rechecking the design of of a board that I will be making in the next few days and I just noticed the pinout of the Texas Instrument 74LS157 is different than the pinout
from Fairchild or Signetics?
TI says Inputs 3A=11 3B=10 4A=14 4B=13! Everyone else has it as 3a=14 3b=13 4a=11 4b=10! who is right?
Even the Library in ExpressSCH has it other than what TI shows in thier Data BooksTI?
I dont know which one to trust!
Regards
Mike