Path: ...!weretis.net!feeder9.news.weretis.net!panix!.POSTED.2602:f977:0:1::3!not-for-mail From: Hul Tytus 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 Message-ID: References: Injection-Date: Sat, 18 May 2024 19:23:22 -0000 (UTC) Injection-Info: reader1.panix.com; posting-host="2602:f977:0:1::3"; logging-data="8664"; mail-complaints-to="abuse@panix.com" Bytes: 2329 Lines: 44 Yes. One active of 8 at any given time. Aught to be one somewhere. Hul piglet wrote: > John Larkin wrote: > > On Fri, 17 May 2024 10:58:28 -0700, Don Y > > 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