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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: ac138
Date: Sat, 18 May 2024 23:43:25 -0700
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On 5/18/2024 11:03 PM, Jasen Betts wrote:
> On 2024-05-19, Don Y <blockedofcourse@foo.invalid> wrote:
>> On 5/18/2024 12:23 PM, Hul Tytus wrote:
>>> Aught to be one somewhere.
>>
>> Why?  Can you imagine a variety of other applications where a three-bit-code
>> (and ONLY a three-bit-code) would need to be resolved to one of 8 high
>> current drives?
> 
> sprinkler timer, except they usually use AC instead of DC

Electromechanical ones drive the solenoids directly.

And, there is no real NEED for an "electronic" unit to
output a three bit code (plus enable!) instead of 8
discrete outputs (which also allows multiple zones to
be active simultaneously, including a "master valve"
required for ANY of the others to receive water).  It's
easier/cheaper to buy an MCU with a few extra pins.

[I use three pins per valve:  "pull-in", "hold" and "sense"

Now, where are the "other" applications in that "variety"?