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?
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?
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.
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.
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?
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
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?
On 5/17/2024 10:58 AM, Don Y wrote:
...
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.
These four and six channel devices might be close to what Don is talking about:
https://www.infineon.com/cms/en/product/power/smart-power-switches/multichannel-spi-switches-controller/spoc-plus-2-multichannel-spi-high-side-power-controller/
Aught to be one somewhere.
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?
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
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