On 5/20/2010 12:14 PM, Orchid XP v8 wrote:

>
> Datasheets aren't manuals. They assume that you already know what, say,
> a Gated D-Latch is, and that you just want to know what its maximum
> driving current is or something. If you *don't* already know what a
> Gated D-Latch is, the datasheet will be of no use at all. You need
> *real* instructions.
>

Many datasheets will give you a truth table, and some even have 
schematic diagrams. They assume a basic understanding of electronics, 
though.


>> Have you ever looked at e.g.
>> http://en.wikipedia.org/wiki/File:TTL_npn_nand.svg ?
>
> 1. What is this thing?

A TTL NAND gate

>
> 2. How does it help?
>

You should be able to see why the input floats high from the schematic.

-- 
~Mike

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