How to connect three 8 bits counters 74LS590 to a PIC uC?

Status
Not open for further replies.
L

leto

Junior Member level 1
Joined
Jan 24, 2006
Messages
15
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,424
Hi,

I want to connect three 8 bits counters (74LS590) to a PIC uC, but i just want to use no more than 9 or 10 pins. Someone tell me about 72LS244, but I dont understand how can i connect it. Could anyone send me a simple schematic or tell me more about LS244 ?

thank you
 

Re: 74LS244 ?

I don't think you need 244 buffers ..
The 74LS590 has tri-state outputs controlled by pin G .. You can connect 3 or more 590s in parallel and read the output of selected counter by activating it's output enable pin (G) ..

Regards,
IanP
 

    L

    leto

    Points: 2
    Helpful Answer Positive Rating
74LS244 ?

Tahnk you,

IanP you're right, you mean I can connect it in parallel? Do i need some resistors or something or can connect ir directly. Could you draw a text schematic?

Regards
 

Re: 74LS244 ?

These outputs can be connected directly - no external components are required ..

Just connect:
Qa1 to Qa2 and Qa3 ..
Qb1 to Qb2 and Qb3 ..
Qc1 to Qc2 and Qc3 .. and so on ..
and use 3 microcontroller pins to control G1, G2 and G3 .. and remember, only one G can be "L" at a time ..

Regards,
IanP
 

    L

    leto

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…