CD74HC4059: Query on usage of CMOS Programmable Divide by N counter

Arvind Gupta

Prodigy 70 points

Part Number: CD74HC4059
Other Parts Discussed in Thread: SN74LS292

Hi,

I am new to TI forum and was looking for some advise. Hope someone can help.

I need to implement a ‘divide by 2^20’ counter using 47HC4059 IC. In this regard I had the following queries pls:

Can I use it to divide a LVCMOS3V3 output of a crystal oscillator? If so, can anyone provide me an exact circuit diagram (with information on decoupling capacitors) for doing so?
Can I use a single IC to create a divide by 2^20 and 2^10 signals of the same clock signal?
If I give a 3.3v supply, will the output signal(s) be compatible with input pins other LVCMOS3v3 devices?
In case there are any new ICs which have come up for this purpose, can anyone pls. inform me of the part number pls?

Looking forward to answers of all the queries pls.

Thanks and Regards,

Arvind Gupta.

over 6 years ago

0 Harish Singh over 6 years ago

Intellectual 995 points

Hi Arvind,

Why do you need such a huge frequency divider? What is the input clock frequency that needs to be divided?
You can generate the square pulse from any crystal oscillator by using 2 resistors, 2 loading caps and a general CMOS inverter. Try google.

Regards,
Harish KS

0 Arvind Gupta over 6 years ago in reply to Harish Singh

Prodigy 70 points

Thanks for your response. I have a 50 MHz clock in my FPGA based design. In it, I need to give a delay of 1 or 2 secs after which the output is to be displayed. Hence either I can implement the clock divider inside the FPGA (which will consume a lot of internal resources) or I can implement it with a external clock divider IC.

Regards,

Arvind Gupta

0 Dylan Hubbard over 6 years ago in reply to Arvind Gupta

TI__Mastermind 44905 points

Hi Arvind,

The device you mentioned wont be able to divide by 2^20 and we don't have any 20 bit counters. You will need to cascade two counters together for this. The biggest counter we have is 16 bit. This increases the difficulty of implementing an external divider here. The answer to number 2 is no even if we had a 20 bit counter. The answer to number 3 is yes, it will output high at 3.3 V when powered by 3.3 V

0 Arvind Gupta over 6 years ago in reply to Dylan Hubbard

Prodigy 70 points

OK. What is the part number for the IC for divide by 2^16 pls. Also requesting its exact circuit diagram to divide in this mode.

Thanks and Regards,

Arvind Gupta

0 Harish Singh over 6 years ago in reply to Arvind Gupta

Intellectual 995 points

Hi Arvind,

Have a look into SN74LS292.

Regards,
Harish KS

0 Dylan Hubbard over 6 years ago in reply to Harish Singh

TI__Mastermind 44905 points

Thanks Harish for that part recommendation!

Arvind,

As Harish said, the SN74LS292 is something you can take a look at. Though, it may not be able to handle the 50 MHz frequency as it is only spec'd for 30 MHz. Here is the link to our counter devices. You can use the filters on the side to pick out the one you need. The bit # will help you find the 2^16 counter.
www.ti.com/.../products.html

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CD74HC4059: Query on usage of CMOS Programmable Divide by N counter