Any prescaler IC suitable for my requirements?

Discussion in 'General Electronics Chat' started by dumindu89, Apr 6, 2012.

  1. dumindu89

    Thread Starter Member

    Oct 28, 2010
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    I want a prescaler IC (TTL) which divide the input frequency of 80-110 MHz to 10-30MHz. Divided by 4 prescaler IC will match my requirements. But I couldn't find such a IC yet available in the market.

    If you know such a IC please let me know ASAP. It would be a great help to me.

    -Thanks in advance
     
  2. John P

    AAC Fanatic!

    Oct 14, 2008
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  3. MrChips

    Moderator

    Oct 2, 2009
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    74S74 max freq is 110MHz
    74F74 max freq is 125MHz

    One package has two D flip-flops which combined will give divide by 4.
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Here are a couple:

    SP4653 256 deler Plessey DIP8 1 GHz
    SP4660 DIP8 :256 prescaler DIP8 1 GHz
    SP4740 DIP8 :256 prescaler TTL out
    SP4902 Prescaler :2 max. 2.5 GHz DIP8
    SP8629 100 prescaler 150 MHz (typ. 200 MHz) DIP8
    SP8630A 10 prescaler 600 MHz Vcc=-5.2V
    SP8647B 10/11=prescaler 250 MHz DIL Vcc=5V
    SP8685A 10/11-prescaler 500 MHz DIL Vcc=-5.2V
    SP8704 =MB501LP divider :128/129/64/65 1GHz lowpower only 10 mA
    SP8712 :4 2,5GHz DIL14 39.90
    SP8719M =SP8792 but 550 MHz; 80/81 divider plcc
    SP8792 Prescaler :80/81 225 MHz DIP8

    Bertus
     
  5. ssnyde

    New Member

    Apr 4, 2012
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  6. John P

    AAC Fanatic!

    Oct 14, 2008
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    Those SP- parts are emitter-coupled logic. Usable if you must, I guess. The data sheet I saw for the 74F74 said max clock frequency "typical" 125MHz, but "minimum" only 100MHz. I don't know how confident you'd need to be in order to accept the "typical" rating.

    But the sn74auc1g74 is a speed demon!
     
  7. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    There are more prescalers like the:
    MB501LP DIP 1.1 Ghz 1:64/128
    MC12079D SMD 2.8 Ghz 1:64/128/256
    MC12080D SMD 1.1 Ghz 1:10/20/40/80
    MC12093D SMD 1.1 Ghz 1:2/4/8
    MC10295D SMD 2.5 Ghz 1:2/4
    U813BS SIL6 1.3 Ghz 1:64
    U891BS DIP 1.3 Ghz 1:64
    11C90 DIP 600 Mhz 1:10/11
    95H90 DIP 300 Mhz 1:10/11

    Bertus
     
  8. dumindu89

    Thread Starter Member

    Oct 28, 2010
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    There is no maximum frequency mentioned in the datasheet. Will it operate up to 110 MHz?

    Are there any divided by 2,4 or N counter ICs available in the market that are working between 80MHz-110MHz?
     
  9. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    On the top of page 4 the fMAX is given for the different supplyvoltages.

    Bertus
     
  10. panic mode

    Senior Member

    Oct 10, 2011
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    N17SZ74 will work down to low frequencies (DC) and up to 200MHz at 3.3V or up to 250MHz at 5V, but check package size. this is smallish and may be difficult to work with. MC12093D is larger and goes up to 1.1GHz but min output frequency is 12.5MHz (min input freq. 100MHz)
     
  11. dumindu89

    Thread Starter Member

    Oct 28, 2010
    113
    0
    That means I can use this flip flop up to 150 MHz if I give Vcc of 2.5V ?


    Can you tell me any divided by 2,4 or N counter ICs available in the market that are working between 80MHz-110MHz too?
     
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