Re: Where to start on Missile Command PCB repair

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.)
>>>>>
>>>>> --------------------------------------------------------------------------
>>>>>
>>>>>
>>>>> ---------------------------------------------------------------------------
>>>>> ** Unsubscribe, subscribe, or view the archives at
>>>>> http://www.vectorlist.org
>>>>> ** Please direct other questions, comments, or problems to
>>>>> chris@westnet.com
>>>>>
>>>>
>>>>
>>
>

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Fri Nov 1 09:26:16 2013