What no more 7494?

Hi Guys,

Have just looked for a 7494 asyn ripple through counter and apparently its now obsolete (me aswell)
Is there an off the shelf chip that will do the following?

Async divide/counter, serial in par out, TTL .
I am cheating I know but If anyone has any ideas then I'd appreciate it.

Willy

Hi,

Did you look for the LS version, 74LS94 ?

MrAl said:

Hi,

Did you look for the LS version, 74LS94 ?

Click to expand...

Yep no luck, surprised that I cant find anything suitable, 4 flip flops is a bit of a pain.
Willy

I think Nikko Electronics still carry the 74LS94

Hi tw,
many thanks for the heads up. Also for bringing Nikko to my attention'
Willy

tw,

74LS94 is par in serial out.
any other ideas?
willy

hi 52,
The original 7494 is a parallel to serial S/R.

As Eric pointed out, the 7494 is a parallel to serial device containing 4 R-S flip flops. Although I mentioned the 74LSxx version from Nikko, I have no idea on the quantity that you need. If it's only a couple for a one off repair or proof of concept etc, then you can find them on the 'bay in small quantities: https://www.ebay.co.uk/itm/Texas-In...al_Components_Supplies_ET&hash=item3a7700b960

Does it have to Asyncronous reset? the 74ls90 is syncronous ripple counter!!

Did you look at the 74AHC594?

Hi Gents,

Many thanks for your time and info. I feel it only right to admit to a little confusuion now in that what I was looking for in the O/P was maybe wrong. Perhaps if I tell you what I am trying to achieve would be more sensible. I am looking to divide a clock pulse by 4 out-putting on 4 individual outputs from a serial clock input. This clock input is derived from a 4017 decade counter (for a divide 10 function) which is fed from a V to F convertor a TC9400. Now I thought that I could use this latter device to divide by 4 utilising the MR but no go. As the reset does so on the trailing edge it efectively places a 'hic-up' in the chain by missing an incoming clock pulse. So by divide by 4 is a 4 beats followed by one of silence so to speak.
Basically what I am after is a sequencer or chacer circuit I would imagine akin to a four channel disco light sequencer.
The speed of the 'chase' being dependant on the clock pulse rate from the TC9400. Any ideas would be most welcome.

Willy

hi,
It should be possible to divide by 4 using the correct sense for the 4017's input clock, and to Reset the 4017 back to pin3 '0' on Q4 pin10.
E
Do you have a circuit diagram of your version to post.?

hi 52,
This is a divide by 4 chaser.

Hi Eric,


Yep you correct. Working fine now. Thanks go to you and also the others for there interest and comments.
Regards,
A still learning
Willy