Need Ic which can Enable Its outputs One by One!

[Shahriar]

Hi

I need an IC (i.e. 74XXX Series) with 8 or more outputs. The outputs will be enabled on by on after each other when I trigger the Clock pulse Input. the important note is that the outputs should stay enabled until I reset the IC.

ThanX in advance
Shahriar

[Ldanielrosa]

With that requirement, you're not likely to find many chips that fit the bill.  You'll probably have to use an FPGA.

[EdwardM]

Hi Shahriar

Looks like an ideal and simple job for a PIC - perhaps 16F84?, Port A 8 bits, Port B 5 bits.

Best of Luck

Ed

[EdwardM]

Hi again

Or alternatively, you could use a series of flip-flops with common clock/clear and Q output taken to D input of next flip-flop

Best of Luck

Ed

[Shahriar]

Yes!
Using a series of D Flip-Flps. Tricky ;)

ThanX - Shahriar

[hotwaterwizard]

http://www.semiconductors.philips.com/acrobat_download/datasheets/74HC_HCT373_CNV_2.pdf
http://www.semiconductors.philips.com/acrobat_download/datasheets/74HC_HCT563_CNV_2.pdf
http://www.semiconductors.philips.com/acrobat_download/datasheets/74HC_HCT573_CNV_2.pdf

[hotwaterwizard]

How about this?
Just add an SCR to each output to make it latch each one.
Dropout the power and all will reset.

[Miles Prower]

I need an IC (i.e. 74XXX Series) with 8 or more outputs. The outputs will be enabled on by on after each other when I trigger the Clock pulse Input. the important note is that the outputs should stay enabled until I reset the IC.

I never heard of a 74XX that would do that exact thing. However, I did design a circuit that accomplishes the same thing. You could drive it with something like a ring counter (4071) or use a binary counter driving the address lines of a 3-line-to-eight-line decoder. Once you run that, you will have eight lines that go high in succession, and stay high until you reset.

This works since I have built it.