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Sure. Mostly for military replacements. That's why several of my '60's Motorola designs are still manufactured and sold by Lansdale.

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | I love to cook with wine Sometimes I even put it in the food

Always was:

But what really blows my mind is the longevity of the CD4000 series. Much better fuel economy since day one. A Fairchild sales guy told me in the early 90's that I'd be foolish to design them in and that his new logic stuff would be much better. Sure, but it cost more than double. And here I am, it's 2009 and I am still designing in CD4000 chips by the bucket load.

--
Regards, Joerg

http://www.analogconsultants.com/

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Is '4000 series still cheaper than 74HC' ??

...Jim Thompson

--
| James E.Thompson, P.E.                           |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
 I love to cook with wine     Sometimes I even put it in the food

Very close race, give or take a penny. The kicker is this: With CD4000 you can control FETs that are only Rdson-guaranteed at 10V Vgs. 74HC requires logic level and that's when things become pricey. At higher voltages, roughly 200V and above, you can't even get logic level FETs. It's nearly all 10V Vgs up there. Some will work at 6V anyhow and people "design" to that. I would never do that.

--
Regards, Joerg

http://www.analogconsultants.com/

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Well, there are certain advantages of using slow CMOS over modern (high speed) logic. First is the noise immunity can be quite large by using a 15V supply as compared to (say) 2.5V max supply; a roughly 7V noise immunity compared to 1.2V noise "immunity". Second, being slow translates to ignoring fast input spikes as compared to responding to and enlarging (width, amplitude or both) such spikes. Third, being slow translates to orders of magnitude less RFI as well as less signal coupling between traces.