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'[EE] Favorite 7400 Series Logic'
2007\11\27@031613 by Forrest W Christian

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My 7400 series logic parts drawer is a bit empty - at least of useful
stuff, so I'm going to replenish it.....   And since I can't find a good
assortment anywhere - most of them contain mostly the junk parts I
already have... I figured I'd just start my own assortment.   Plus, I'm
starting to do surface mount here and there and am thinking along that
line as well.

I've got my favorites of the 74' series, and I'd love to hear what
others on the list like to keep around.  Think of this as the 74 series
version of the famous "what PIC should I stock" question.

(And for brevity, I'm skipping the family - I'm planning on stocking HC
and HCT's of each type, unless someone has a good suggestion as to why
some other family would be useful).

My goal with this is to end up with a list of things I am likely to want
when designing a modern one-off digital circuit, probably with a PIC
involved.

My (very small) list so far goes like:

7400 - Quad NAND
7404 - Hex Inverter
7414 - Schmitt Trigger Inverter
74137 - 8 output Demux w/latch
74151 - 8 input Mux
74165 - Shift Register - Parallel In
74221 - Mono Mult. Schmitt Trigger.
74540 - Inverting Octal Buffer/Line Driver, with output pins all on the
same side.
74541 - Noninverting Version of 540
74595 - Shift Register - Parallel Out

There are some I've specifically excluded, but would like to know
opinions on these exclusions:

All the various AND, OR, XOR, multiple-in gates, etc.   After all, you
have a 7400, what else do you need?

7447, BCD to 7 Segment - When was the last time you drove a 7 segment
display this way?

74240, 241, 244 - I prefer the 540 and 541, since I'm currently

Counters.

Flip Flops and generic latches.

So, what did I miss?

-forrest




2007\11\27@041050 by wouter van ooijen

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> I've got my favorites of the 74' series, and I'd love to hear what
> others on the list like to keep around.  Think of this as the
> 74 series
> version of the famous "what PIC should I stock" question.
>
> (And for brevity, I'm skipping the family - I'm planning on
> stocking HC
> and HCT's of each type, unless someone has a good suggestion
> as to why
> some other family would be useful).

I'd skip HCT: what good is a reduced margin on the 0 side except when
interfacing to TTL chips?

> My (very small) list so far goes like:

I'd add some from the 4 series: analog switches and muxes, 4060, etc.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu



2007\11\27@043036 by Forrest W Christian

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wouter van ooijen wrote:
> I'd skip HCT: what good is a reduced margin on the 0 side except when
> interfacing to TTL chips?

Good point...  About the only place I've really used HCT is on the
74HCT14's, but then I was looking for a very specific threshold value...
 a 74HCT14@5V will reliably trigger from 3.3V CMOS logic.

-forrest

2007\11\27@050643 by Mike Harrison

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On Tue, 27 Nov 2007 10:10:32 +0100, you wrote:

>> I've got my favorites of the 74' series, and I'd love to hear what
>> others on the list like to keep around.  Think of this as the
>> 74 series
>> version of the famous "what PIC should I stock" question.
>>
>> (And for brevity, I'm skipping the family - I'm planning on
>> stocking HC
>> and HCT's of each type, unless someone has a good suggestion
>> as to why
>> some other family would be useful).
>
>I'd skip HCT: what good is a reduced margin on the 0 side except when
>interfacing to TTL chips?


HCT is very handy for Interfacing to 3.3v logic.


2007\11\27@051536 by Mike Harrison

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On Tue, 27 Nov 2007 01:16:06 -0700, you wrote:

{Quote hidden}

But why go to the hassle (how many HC00 gates do you need to make a HC86?
- HC/HCT chips cost pennies - far less than anyone's time to improvise other functions from a single
gate type. Muxes can be a good substitute for multi-input gates.

Any general selection should certainly include 00,02,04,08,32,86
Also HC573 and 574 octal latches with through pinouts
HC245 is always handy as an octal buffer - you probably don't often need a bidirectional one, but
think of it as being able to control the PCB layout by setting the direction pin.
HC4040 for when you need a long counter
HC74
HC138 and 139



2007\11\27@053757 by Alan B. Pearce

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>All the various AND, OR, XOR, multiple-in gates, etc.   After all, you
>have a 7400, what else do you need?

Rather than stocking conventional 14 pin packages, I would look seriously at
stocking the individual gates in SOT-23 packages that are available from TI
and other vendors.

How many gates do modern MCU based circuits usually need nowadays? Most
often it is an individual gate, or one of this gate, one of that gate, and
one of another.

2007\11\27@063350 by Xiaofan Chen

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On Nov 27, 2007 6:38 PM, Alan B. Pearce <spam_OUTA.B.PearceTakeThisOuTspamrl.ac.uk> wrote:
> >All the various AND, OR, XOR, multiple-in gates, etc.   After all, you
> >have a 7400, what else do you need?
>
> Rather than stocking conventional 14 pin packages, I would look seriously at
> stocking the individual gates in SOT-23 packages that are available from TI
> and other vendors.

Agreed if the OP can handle SOT-23 easily.

> How many gates do modern MCU based circuits usually need nowadays? Most
> often it is an individual gate, or one of this gate, one of that gate, and
> one of another.

Sometime we still use a few gates and then a quad may still make sense.
But most often single gate is the way to go. There are now many smaller
package (SC70) now if space is a problem. Then if there are many more gates
needed, an MCU or CPLD may be the way to go.

2007\11\27@091804 by Thomas C. Sefranek

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Forest,

Depending on where you are, my inventory is at your disposal.
hamradio.cmcorp.com/inventory/LOGIC/TTL.html
I use TTL less and less...
Feel free to make a request.

Tom

 *
 |  __O    Thomas C. Sefranek  .....WA1RHPKILLspamspam@spam@ARRL.NET
 |_-\<,_   Amateur Radio Operator: WA1RHP
 (*)/ (*)  Bicycle mobile on 145.41MHz PL74.4

ARRL Instructor, Technical Specialist, VE Contact.
hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org

{Original Message removed}

2007\11\27@192524 by James Newton

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Good list!

I've found '138's and '139's to be handy in some cases because you can set
or clear more than one pin at a time very quickly. But needing that is the
rare case to be honest.

How about a GAL or similar?

--
James.


{Original Message removed}


'[EE] Favorite 7400 Series Logic'
2007\12\02@091316 by Morgan Olsson
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The AC series have strong outputs.
I even used 74AC04 in power conversion and direct very small motor commutation!

The CMOS4000 series is good to handle larger voltage swings.
-and also include some nice MUX (4051,2,3, PLL 4046, 4060 osc+counter, 4017 1 of 10 counter (used heavily as program counter in my first designs before microcontroller...)
Thera are also CMOS verisons for lower voltage stronger drive and higher speed of the most popular such as those mentionned.  Some even in VHC.

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