Shop OBEX P1 Docs P2 Docs Learn Events
TTL/CMOS Command — Parallax Forums

TTL/CMOS Command

ArchiverArchiver Posts: 46,084
edited 2003-03-24 15:11 in General Discussion
Is there a command that converts from TTL/CMOS or vice versa? Does the stamp
startup as TTL?

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-03-21 14:36
    --- In basicstamps@yahoogroups.com, "Jerry Walker"
    <the_prettiest@h...> wrote:
    > Is there a command that converts from TTL/CMOS or vice versa? Does
    the stamp
    > startup as TTL?

    TTL and CMOS are fundamental chip technologies. TTL stands for
    Transistor-Transistor Logic and usually refers to older bipolar
    transistor input and output stages which consume quite a bit of
    current. CMOS (Complimentary Metallic Oxide Silicon) is a different
    technology that is tolerant of higher voltages and uses much less
    current. I have never seen (or heard of) a software command to
    switch between the two. If you require such capability you will have
    to provide for it with hardware.
    However, I have not done a recent, exhaustive study into emerging
    technologies and it is very possible that someone, somewhere, has
    made an MCU with that capability.
  • ArchiverArchiver Posts: 46,084
    edited 2003-03-21 15:18
    In a message dated 3/20/2003 5:08:01 PM Pacific Standard Time,
    the_prettiest@h... writes:

    > Is there a command that converts from TTL/CMOS or vice versa? Does the stamp
    > startup as TTL?

    From what I see in the stamp manual, the Stamp is configured for TTL level
    signals. I do not see a command to change the input logic from TTL to CMOS.

    Although the logic thresholds are different for TTL and CMOS, when running a
    CMOS IC Vcc at 5v, I have never had a problem using a CMOS input to the
    stamp.


    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2003-03-21 16:12
    CMOS- Complementary Metal Oxide Semiconductor

    Tim

    Original Message
    From: "Hal ALbach" <halbach@f...>
    To: <basicstamps@yahoogroups.com>
    Sent: Friday, March 21, 2003 9:36 AM
    Subject: [noparse][[/noparse]basicstamps] Re: TTL/CMOS Command


    > --- In basicstamps@yahoogroups.com, "Jerry Walker"
    > <the_prettiest@h...> wrote:
    > > Is there a command that converts from TTL/CMOS or vice versa? Does
    > the stamp
    > > startup as TTL?
    >
    > TTL and CMOS are fundamental chip technologies. TTL stands for
    > Transistor-Transistor Logic and usually refers to older bipolar
    > transistor input and output stages which consume quite a bit of
    > current. CMOS (Complimentary Metallic Oxide Silicon) is a different
    > technology that is tolerant of higher voltages and uses much less
    > current. I have never seen (or heard of) a software command to
    > switch between the two. If you require such capability you will have
    > to provide for it with hardware.
    > However, I have not done a recent, exhaustive study into emerging
    > technologies and it is very possible that someone, somewhere, has
    > made an MCU with that capability.
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-03-24 15:11
    This reminds me of when I worked at the CB amp factory. One of the
    assemblers told me the IC chips were made from "Sea weed". I asked if
    he meant 'CMOS' and he replied "Yeah thats it! Sea Moss!"

    Paul

    --- In basicstamps@yahoogroups.com, smartdim@a... wrote:
    > In a message dated 3/20/2003 5:08:01 PM Pacific Standard Time,
    > the_prettiest@h... writes:
    >
    > > Is there a command that converts from TTL/CMOS or vice versa?
    Does the stamp
    > > startup as TTL?
    >
    > From what I see in the stamp manual, the Stamp is configured for
    TTL level
    > signals. I do not see a command to change the input logic from TTL
    to CMOS.
    >
    > Although the logic thresholds are different for TTL and CMOS, when
    running a
    > CMOS IC Vcc at 5v, I have never had a problem using a CMOS input to
    the
    > stamp.
    >
    >
    > [noparse][[/noparse]Non-text portions of this message have been removed]
Sign In or Register to comment.