Jan-Erik Soderholm XA (TN/PAC) wrote:
> michael brown wrote:
>
>>> That's bloody criminal.  Note they have two 7404s in parallel.
>
>> Although I do wonder why they didn't use the other three inverters,
>> maybe they're spares for when you kill the first three.  ;-)
>
>
> If you'd cared to check the IC they are using (TC7WH04FU,
>
http://www.sumisho.co.kr/product/search/search02.asp?vPproductNm=TC7WH04FU)
> you'd seen that it's a 8-pin, 3-inverter SOIC chip.

I went by the OP's description of it being a 7404 HEX inverter, in which
case there would be six inverters.  I stand corrected on the irrelevant
issue.

> And, again, they do *not* claim it's a RS232 interface !
> They say it's a "serial interface", which is perfectly valid.
>
> What is the problem ?

They also say that you connect it to a PC which is well known to be
RS-232 (even though it probably strictly isn't in many cases).  I
suppose that if you'd cared to go check out their carrier/dev board (and
it's documentation) for the chip, you'd see that they clearly call the
DB9 connector an RS-232 interface.  Funny, I can't seem to locate any
level convertors on the board or in the schematic for it.  Is that
perfectly valid as well?

http://www.basicx.com/Products/Parts/bx24devboard2.gif
http://www.basicx.com/Products/Parts/bx24devboardsch.gif

michael brown

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