Re: [CAD_CAM_EDM_DRO] Re: TTL to HTL signal conversion

On Friday 06 February 2004 01:49 pm, birdmanure wrote:

> You can do a search on RS-232 bus interface drivers. RS-232
> drivers are designed to work at up to +/-25V. The older
> 1488/1489 (and I believe 75451/75452)

That's 75188 and 75189.

> chips require +/-12V power supplies,

Only the driver, the receiver runs off a single +5v supply.

I'm not sure if these would work. A minimum "valid" level for RS232 is 3
volts, above or below ground, and the region in between, where zero volts
is, is technically undefined by the standard. Which may not mean this won't
work, I haven't actually tried seeing what the receiver chip will do under
those circumstances. I'm also not familiar with the output specs of HTL,
what constitutes a "low" output on one of those parts? I sure as heck don't
have any data on them handy...