[sdiy] 40106 astable multivibrator - origins

[Phillip Gallo]

Ben,
My recollection was that intersil bought RCA Semi.
Harris bought Intersil.  Harris later spun off some of its lines under the
name Intersil.
Renasas has those lines using that name today.

The 74C family of CMOS Parts introduced in 1973 (vs. CD4xxx in 1968)
included the 74C14 schmitt.but the 4000 series didn't have a schmitt buffer
until the 40106.

regards,
p




On Mon, Nov 20, 2017 at 11:12 PM, Ben Bradley <ben.pi.bradley at gmail.com>
wrote:

> So when was the 40106 first made?
>
> I have "Understanding CMOS Integrated Circuits" Copyright 1975 that I
> bought new in 1976 (!). A few pages in back have pinouts of some
> common CMOS chips. It doesn't show a 40106 but I'm sure this book was
> not meant to have a complete list of CMOS chips available at the time.
>
> After the gratuitous-and-obligatory-at-the-time chapters on fabs and
> "how to make CMOS ICs" (which is pretty useless - how many readers are
> going to start making CMOS chips from reading this book? I think very
> little of these first 90-odd pages are needed to understand the rest
> of the book), the first schematic is the common RC two-inverter
> oscillator, two cascaded inverters with a cap and two resistors. So
> much for starting of a book on digital logic with a purely digital
> logic schematic.
>
> I also have the 1975 RCA "COS/MOS Integrated Circuits" databook
> SSD-203C, The only Schmitt trigger it lists is 4093. It does show a
> schematic of a gated "astable oscillator" for Fig. 19, p. 383 with
> single R from output to one input, single C from that input to ground,
> and the other input labeled "TO CONTROL SIGNAL OR VDD." Might this be
> the first circuit for a CMOS Schmitt trigger single-R-C oscillator?
>
> A little googling finds a pdf of this 1975 databook here:
> http://www.introni.it/pdf/RCA%20-%20COSMOS%20Integrated%20Circuits.pdf
>
> Looking online, this TI datasheet (it says "Data sheet acquired from
> Harris Semiconductor" - did Harris get RCA's parts at one point, or
> were they both making this part at the same time?) has the exact same
> schematic shown in Fig. 18 p. 4:
> http://www.ti.com/lit/ds/symlink/cd4093b.pdf
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