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Clock Signal... — Parallax Forums

Clock Signal...

ArchiverArchiver Posts: 46,084
edited 2002-09-13 19:05 in General Discussion
Hello All,

Can a clock signal drive more than one digital(TTL) I.C.? If so,
how many I.C.'s can I drive, before I have to worry about "loading" the
clock signal down? This is a BS2 project, but I admit that the question is
slightly off-topic.

Thanks,

Tim

P.S. Martin, the Stamps In Class Industrial Control text was just what I
needed. Thank you for pointing me in that direction.


Timothy Medema
CrystaLite, Incorporated
3307 Cedar St. (425) 745-6000 800-666-6065
Everett, WA 98201 Fax: (425) 257-0232

www.crystaliteinc.com
<mailto:timm@c...>timm@c...


The information transmitted is intended only for the person or entity to
whom it is addressed and may contain confidential and/or privileged
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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-09-13 16:25
    At 08:25 AM 9/13/02 -0700, you wrote:

    >Hello All,
    >
    > Can a clock signal drive more than one digital(TTL) I.C.? If so,
    >how many I.C.'s can I drive, before I have to worry about "loading" the
    >clock signal down? This is a BS2 project, but I admit that the question is
    >slightly off-topic.

    This depends on a few factors such as speed, what your output driver is
    capable of, and the overall distance from the clock source.


    >Thanks,
    >
    >Tim
    >
    >P.S. Martin, the Stamps In Class Industrial Control text was just what I
    >needed. Thank you for pointing me in that direction.
    >
    >
    >Timothy Medema
    >CrystaLite, Incorporated
    >3307 Cedar St. (425) 745-6000 800-666-6065
    >Everett, WA 98201 Fax: (425) 257-0232
    >
    >www.crystaliteinc.com
    ><mailto:timm@c...>timm@c...

    Beau Schwabe Mask Designer II - ATL
    National Semiconductor Enterprise Networking Business Unit
    500 Pinnacle Court, Suite 525 Wired Communications Division
    Mail Stop GA1 Norcross, GA 30071
  • ArchiverArchiver Posts: 46,084
    edited 2002-09-13 16:34
    The common pratice if you are worried about loading is to use a buffer like
    a 7404 or similar. If you need to "fan out" to a LOT of chips you can
    parallel the inputs to the 7404 (6 in a package) then you can drive many,
    many loads like that.

    Mike B.
    Original Message
    From: "Timothy Medema" <timm@c...>
    To: <basicstamps@yahoogroups.com>
    Sent: Friday, September 13, 2002 8:25 AM
    Subject: [noparse][[/noparse]basicstamps] Clock Signal...


    >
    > Hello All,
    >
    > Can a clock signal drive more than one digital(TTL) I.C.? If so,
    > how many I.C.'s can I drive, before I have to worry about "loading" the
    > clock signal down? This is a BS2 project, but I admit that the question
    is
    > slightly off-topic.
    >
    > Thanks,
    >
    > Tim
    >
    > P.S. Martin, the Stamps In Class Industrial Control text was just what I
    > needed. Thank you for pointing me in that direction.
    >
    >
    > Timothy Medema
    > CrystaLite, Incorporated
    > 3307 Cedar St. (425) 745-6000 800-666-6065
    > Everett, WA 98201 Fax: (425) 257-0232
    >
    > www.crystaliteinc.com
    > <mailto:timm@c...>timm@c...
    >
    >
    > The information transmitted is intended only for the person or entity to
    > whom it is addressed and may contain confidential and/or privileged
    > material. Any review, retransmission, dissemination or other use of, or
    > taking of any action in reliance upon, this information by persons or
    > entities other than the intended recipient is prohibited. If you received
    > this in error, please contact the sender and delete the material from any
    > computer.
    >
    >
    > To UNSUBSCRIBE, just send mail to:
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    >
  • ArchiverArchiver Posts: 46,084
    edited 2002-09-13 19:05
    Thanks Beau and Mike,

    To answer your questions Beau, the clock signals are slow in this
    application - less than 100Hz, the clock is capable of supplying at least
    50mA, and the longest distance needed from the source is only 4 inches or
    so. I'd like to use this signal as clock input to three or four other
    basic digital I.C.'s. Mike, I so appreciate that you included part numbers
    for a "fan-out" configuration. I'll add this to my education archives.

    Tim


    Timothy Medema
    CrystaLite, Incorporated
    3307 Cedar St. (425) 745-6000 800-666-6065
    Everett, WA 98201 Fax: (425) 257-0232

    www.crystaliteinc.com
    <mailto:timm@c...>timm@c...


    The information transmitted is intended only for the person or entity to
    whom it is addressed and may contain confidential and/or privileged
    material. Any review, retransmission, dissemination or other use of, or
    taking of any action in reliance upon, this information by persons or
    entities other than the intended recipient is prohibited. If you received
    this in error, please contact the sender and delete the material from any
    computer.
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