Path: ...!weretis.net!feeder9.news.weretis.net!panix!.POSTED.2602:f977:0:1::3!not-for-mail
From: Hul Tytus <ht@panix.com>
Newsgroups: sci.electronics.design
Subject: Re: ac138
Date: Sat, 18 May 2024 19:23:22 -0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
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References: <v27sad$fuo$1@reader1.panix.com> <v285sd$2a7cm$1@dont-email.me> <fr9f4jtdqtoge7jivttb7h0kd5om1dio4k@4ax.com> <v28l0c$2d9c3$1@dont-email.me>
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Yes. One active of 8 at any given time. Aught to be one somewhere.

Hul 


piglet <erichpwagner@hotmail.com> wrote:
> John Larkin <jjSNIPlarkin@highNONOlandtechnology.com> wrote:
> > On Fri, 17 May 2024 10:58:28 -0700, Don Y
> > <blockedofcourse@foo.invalid> wrote:
> > 
> >> On 5/17/2024 8:15 AM, Hul Tytus wrote:
> >>> Anyone know of an ic similar to the hc/ac138/238 (16 pin,
> >>> 1 input to 8 output multiplexer) but with outputs of the
> >>> open collector/drain style that can handle 2 amps at
> >>> 12 volts?
> >> 
> >> The '138 is a decoder (demultiplexer).  What you are looking
> >> for is more likely considered a hammer driver.  The two
> >> functions tend not to coexist; if you wanted a low-side
> >> driver that could handle 8 loads, you would likely be looking
> >> to drive any *combination* of those loads... an "octal
> >> driver".
> >> 
> >> You can probably find something automotive that would give you
> >> 8 such outputs in a package (though 8@2A would likely be
> >> pushing the power dissipation of a normal package) -- but it
> >> would likely have an I2C or SPI interface, requiring you
> >> to do the "decoding"/selection elsewhere.
> >> 
> > 
> > There are lots of SPI power drivers, like TPIC6595, but not 6 pins.
> > Somebody makes a higher-current 4-channel part.
> > 
> > Some logic chip could drive a power buffer, like ULN2003. But 8 loads
> > at 2 amps each is extreme. Discrete fets make more sense at these
> > currents.
> > 
> > What's the load?
> > 
> > 

> Wouldn???t it be just one load of 2 amps and seven open?

> -- 
> piglet