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A comment on Inside the 8086 processor, tiny charge pumps create a negative voltage. Parent comment

Re:Inside the 8086 processor, tiny charge pumps create a neg... by osamagirl69 on Saturday July 25, 2020 @11:47PM (#23954283)
Most all modern rs232 ports use a similar approach to generate the negative voltages needed as well. The ubiquitous max232 and its copies/clones all use charge pumps to convert a +5v rail to +/-12v rails for the line drivers.
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Re:Inside the 8086 processor, tiny charge pumps create a neg... by kens on Sunday July 26, 2020 @01:04AM (#23954571)
Take a look at the max233 cross-sections by @TubeTimeUS. It looks like a normal DIP integrated circuit, but it has four discrete capacitors in the IC package for the charge pumps.

https://twunroll.com/article/1286136812658806785#

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Re:Inside the 8086 processor, tiny charge pumps create a neg... by osamagirl69 on Sunday July 26, 2020 @12:41PM (#23958274)
Very cool -- I always wondered how they integrated those caps into the package
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