need help

S

sasidhar442

New Member

• Oct 2, 2009

• #1

need ic information
ic 74151
ic 74155
ic 7485
ic 7495
ic 7490
all datasheets
truth tables
logic diagrams
pin diagrams

 

birdman0_o

Active Member

• Oct 2, 2009

• #2

Ever hear of google?

 

RadioRon

Well-Known Member

• Oct 2, 2009

• #3

read this first
https://www.electro-tech-online.com/custompdfs/2009/10/szza036b.pdf

 

birdman0_o

Active Member

• Oct 2, 2009

• #4

Sweet link ron, thanks

 

Q

qdn

New Member

• Oct 2, 2009

• #5

Hmm..., don't get why high level output current is negative and low level output current is positive?

Did a little search, the positive means the terminal is sinking current, conversely, negative is saying current is coming out of the terminal which means it is sourcing current.

 

Last edited: Oct 2, 2009

RadioRon

Well-Known Member

• Oct 2, 2009

• #6

qdn said:

Hmm..., don't get why high level output current is negative and low level output current is positive?

Click to expand...

This is because the industry, by convention, defines the output current as flowing into the output terminal. So a positive value is flowing into the terminal, while a negative value means that current is flowing out of the terminal.

On the TI app note link, find this text on page 33.

JEDEC – The current into the output terminal with input conditions applied that, according to the product specification, establishes a high level at the output.