Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up.
Sign up to join this community
I want to use SN54HC244 chips so I started reading the data-sheet.
It can be found here or directly here (PDF).
On the first page I don't understand the logic diagram:
1A1, 1A2 and 1A3 output labels are all 1Y1. From the table on the second page and the given the pin numbers (18, 16, 14, 12) I think the labels should be as the following image:
Am I mis-understanding something or is the data-sheet wrong?
Am I mis-understanding something or is the data-sheet wrong?
Yes, the current version of the datasheet is wrong.
Notice the text "SCLS130E" on the header of most pages in the current datasheet, which tells us that it is revision E. The mistakes which you highlighted were only introduced in the latest revision to that TI datasheet, when it changed from revision D (August 2003) to revision E in May 2016.
Here is the equivalent, correct, diagram from the previous revision D datasheet - see the header text "SCLS130D" below:
