Re: Where to start on Missile Command PCB repair

Hey Kevin,

Thank you for the information! I've never used Jameco before, I've always
used digikey.

-Grant

On Fri, Nov 1, 2013 at 9:26 AM, Kevin Moore <talon.k@gmail.com> wrote:

> 74S00
>
> http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_676959_-1
>
>
>
> On Fri, Nov 1, 2013 at 8:24 AM, Grant Thienemann <
> grant.thienemann@gmail.com> wrote:
>
>> Ok lets say you have a 74S00, which is for speed, can you replace that
>> with a 74F00?
>>
>>
>> On Fri, Nov 1, 2013 at 9:17 AM, Grant Thienemann <
>> grant.thienemann@gmail.com> wrote:
>>
>>> Hey Rodger,
>>>
>>> Thank you for the information. I'm looking at wikipedia now about the
>>> 74XX series chips, which would be the default standard when looking to
>>> replace a 7400, or 7404 etc, would that be HTC?
>>>
>>> Thanks
>>> Grant
>>>
>>>
>>> On Fri, Nov 1, 2013 at 9:08 AM, Rodger Boots <rlboots2@gmail.com> wrote:
>>>
>>>> Close. HCT is closer. Either should work.
>>>> On Nov 1, 2013 7:52 AM, "Grant Thienemann" <grant.thienemann@gmail.com>
>>>> wrote:
>>>>
>>>>> Ok not to keep getting off topic, but as this is related to the
>>>>> Missile Command repair, I'm going to ask. When I look for 74191 I can't
>>>>> find anything on Digikey, etc, but when I search for 74HC191 it comes up,
>>>>> is that the same thing?
>>>>>
>>>>>
>>>>> On Fri, Nov 1, 2013 at 8:42 AM, <solarfox@triluminary.net> wrote:
>>>>>
>>>>>> On Fri, 1 Nov 2013 00:35:07 -0400, you wrote:
>>>>>>
>>>>>> >So I can generally replace a 7404 with a 74LS04 without any problems?
>>>>>>
>>>>>> *Normally*, yes, but there *are* cases where you can run into
>>>>>> problems. The
>>>>>> switching speed of 74LS-series parts isn't *quite* identical to
>>>>>> standard
>>>>>> 7400-series; the propagation delays of a 7404 vs. a 74LS04, for
>>>>>> example:
>>>>>>
>>>>>> -------- 7404 -------- ------- 74LS04 -------
>>>>>> tPLH 12ns (typ) 22ns (max) 9ns (typ) 15ns (max)
>>>>>> tPHL 8ns (typ) 15ns (max) 10ns (typ) 15ns (max)
>>>>>>
>>>>>> (Source: a very dog-eared and well-used copy of "The TTL Data Book,
>>>>>> vol.2",
>>>>>> Texas Instruments, 1985)
>>>>>>
>>>>>> The difference is, admittedly, pretty small, but it can add up when
>>>>>> you've
>>>>>> got signals flowing through a bunch of different gates, or when
>>>>>> you've got
>>>>>> a more complex chip (such as the 74191). So, depending on the
>>>>>> circuit in
>>>>>> question, there's a small (but non-zero) chance that you *could* end
>>>>>> up
>>>>>> with a "race" condition by swapping a 74LS part into a circuit full of
>>>>>> 7400-series chips.
>>>>>>
>>>>>> --------------------------------------------------------------------------
>>>>>> "I thought I told you to look after him!"
>>>>>>
>>>>>> "He'll be all right; he's a Time Lord."
>>>>>>
>>>>>> "That's just what they're _called_; it doesn't mean he actually knows
>>>>>> what
>>>>>> he's _doing!_"
>>>>>>
>>>>>> --------------------------------------------------------------------------
>>>>>> solarfox@triluminary.net (Gary
>>>>>> Akins jr.)
>>>>>>
>>>>>> --------------------------------------------------------------------------
>>>>>>
>>>>>>
>>>>>> ---------------------------------------------------------------------------
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>>>>>> chris@westnet.com
>>>>>>
>>>>>
>>>>>
>>>
>>
>

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Received on Fri Nov 1 09:27:31 2013