High voltage is when the input voltage is voltage that is recognized as being high when it is above this value.
Conversely, low voltage is when the input voltage is voltage that is recognized as being low when it is below this value.
Let’s look at the high voltage and low voltage of the voltage regulator’s CE terminal to see how this is specified for an actual product.
DC/DC converter (XC9236): Electrical characteristics
| PARAMETER | SYMBOL | CONDITIONS | MIN. | TYP. | MAX. | UNIT | CIRCUIT |
|---|---|---|---|---|---|---|---|
| CE "H" Voltage | VCEH | VOUT=0V, Applied voltage to VCE, Voltage changes Lx to “H” level | 0.65 | - | 6.0 | V | ③ |
| CE "L" Voltage | VCEL | VOUT=0V, Applied voltage to VCE, Voltage changes Lx to “L” level | VSS | - | 0.25 | V | ③ |
For the above product:
CE function high voltage : Always recognized as high when 0.65V to 6.0V
CE function low voltage : Always recognized as low when VSS (0V) to 0.25V
To put it another way, this shows that it is not possible to tell if the CE function is high or low when the applied voltage is between 0.25V to 0.65V.
To ensure the high/low state, it is important to design the product to ensure the input voltage is within the high voltage/low voltage range.