Peak performance

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davek
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Peak performance

 I am wondering if there is a part that can run a counter and DFF at 40 to 80 MHz at 3.3V?  Thanks.

Device: 
olehs
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Joined: 2018-02-07 11:40
Hi davek,

Hi davek,

Thank you for your question,

Which IC do you want to use for your application? Could you please describe the application you want to implement? Do you want to apply from 40MHz to 80MHz at input PIN and perform some functionality inside the chip? Should the frequency be applied to counter (DFF) clock input?

Best regards, 

Oleh Sapiha

davek
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I am looking to convert a

I am looking to convert a sensor interface to a ST Micro DCMI interface.  The current sensor interface uses pulses to indicate VSYNC, HSYNC and FSYNC.  I would like to use the part to convert these signals to levels which is what the ST Micro requires to function.  The interface can run up to 80 MHz.  I don't plan to buffer the pixel data so I would have to be able to capture the input signal, sense its value and set the output signal in less than 10ns if I wanted to operate at 80 MHz (the ST notes only 1 ns of setup and hold time for the signals).  I figure I can use a DFF and Latch to sense the pulse and set the level of the output signal.  I then have to count pixel clocks to know when to deasseart the signal (wether it be VSYNC or HSYNC).  I am open to using any part that would have a minimum of 4 inputs and 3 outputs and can work at the higher speeds.  Thanks for the help.

olehs
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davek,

davek,

Thank you for showing your idea. 

I'm not sure if GPAK is fast enough to work with so high-speed frequency 80MHz. If you look through the attached file Typical Delay Estimated time, you will see that propagation delay time is commensurate to the period of the input frequency you want to detect. It means that the chip may not react to the signal and filter it.

If you want to find more information about propagation delay and the maximum frequency please use the link https://www.dialog-semiconductor.com/an-cm-283

Best regards, 

Oleh Sapiha