• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 20 subscribers
  • Views 873 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Part Suggestion for 10Mhz to 1kHz divider

David Wang60
Intellectual 980 points
Other Parts Discussed in Thread: SN74LVC1G123, CD74HCT390, SN74LV221A

I need to divide a 10Mhz CMOS square wave signal to 1kHz. Do you have any suggestions on logic parts that would fit this? It needs to be very low power and small footprint.


Thanks

  • 0
    TI__Guru 62240 points
    Hi David ,

    Here is the link for the programmable frequency dividers offered .

    www.ti.com/.../rate-multiplier-frequency-divider-timer-products.page
    You could also use sn74LVC1G123 to configure it with RC for 1Khz output frequency .
  • 0 in reply to ShreyasRao
    Intellectual 980 points

    I was looking at using two CD74HCT390 hooked together. The first one will be chained to create a divide by 100 using BCD option, and then fed ingot he second CD74HCT390 to ultimately create a divide by 10k. What is the advantage of this versus using the SN74LVC1G123 method? Any suggestions?

    I would assume that the G123 will be not as dependent since you are relaying on the R/C which can have variations. The 390 should be more deterministic so the frequency will have the same stability from input to output. It would just have a delay that would be consistent from period to period...

  • 0 in reply to David Wang60
    TI__Guru 62240 points
    Hi David ,

    Using a counter to divide the clock by 10K is good choice too.
    For the LVC1G123 , the RC needs to be precise and shouldn't vary with temperature , if you plan to use it across temp.
    The non-retriggerble version of the multivibrator like sn74LV221A is needed to avoid triggering for every clock edge .