user71576: Or is it 5 V only?
https://www.st.com/en/automotive-analog-and-power/l9823.html
I see in the data sheet it says under Absolute Maximum:

Supply Voltage:  VDD -0.3 V to 7 V

Then, under Electrical Characteristics:

4.5 V < VDD < 5.5 V; unless otherwise specified.

Is the Electrical Characteristics section just listing values for an example voltage of 5 V, or does the chip need 5 V to work properly?

user14095: No. The undervoltage puts it in reset at 3.95V per the ST data sheet. It is a  5v only part with a wide tolerance on VCC. It was designed many years ago as an automotive part. It is a very nice part and performs well.

user61722: The Absolute Maximum section in a datasheet describes what will damage a component, or shorten its life span; it does not state the acceptable range of values that will make the component work as expected. It is not a design guideline.
You can deduce from these Absolute Maximum data that a Vdd of 3.3 V will not damage the IC, but not that it will work well at that voltage.
In this case, the datasheet says that all Electrical Characteristics are specified at a Vdd of about 5 V. This by itself does not necessarily mean the IC won't work at lower voltages, but it is a hint.
But, further on in the Electrical Characteristics, it is stated that the IC could reset at any Vdd between 2.5 V and 3.95 V, so the IC will very probably not work reliably at 3.3V.

71576: <p>Or is it 5 V only?</p>
<p><a href="https://www.st.com/en/automotive-analog-and-power/l9823.html" rel="nofollow noreferrer">https://www.st.com/en/automotive-analog-and-power/l9823.html</a></p>
<p>I see in the data sheet it says under Absolute Maximum:</p>
<blockquote>
<p>Supply Voltage:  VDD -0.3 V to 7 V</p>
</blockquote>
<p>Then, under Electrical Characteristics:</p>
<blockquote>
<p>4.5 V &lt; VDD &lt; 5.5 V; unless otherwise specified.</p>
</blockquote>
<p>Is the Electrical Characteristics section just listing values for an example voltage of 5 V, or does the chip need 5 V to work properly?</p>
 14095: <p>No. The undervoltage puts it in reset at 3.95V per the ST data sheet. It is a  5v only part with a wide tolerance on VCC. It was designed many years ago as an automotive part. It is a very nice part and performs well.</p>
 61722: <p>The <em>Absolute Maximum</em> section in a datasheet describes what will damage a component, or shorten its life span; it does not state the acceptable range of values that will make the component work as expected. It is not a design guideline.</p>
<p>You can deduce from these Absolute Maximum data that a V<sub>dd</sub> of 3.3 V will not damage the IC, but not that it will work well at that voltage.</p>
<p>In this case, the datasheet says that all Electrical Characteristics <em>are specified at</em> a V<sub>dd</sub> of about 5 V. This by itself does not necessarily mean the IC won't work at lower voltages, but it is a hint.</p>
<p>But, further on in the Electrical Characteristics, it is stated that the IC could reset at any V<sub>dd</sub> between 2.5 V and 3.95 V, so the IC will very probably not work reliably at 3.3V.</p>
