| θJA | Thermal Resistance Junction to Ambient | 75 | °C/W | 20-pin SSOP package (SS) |
| 53 | °C/W | 20-pin VQFN package (REB) |
| TJMAX | Maximum Junction Temperature | Refer to the Absolute Maximum
Ratings section. |
Note:
- Power dissipation is calculated as follows: PDIS =
VDD × {IDD - Σ IOH} + Σ
{(VDD - VOH) × IOH} + Σ
(VOI × IOL).
- Internal Power
Dissipation is calculated as follows: PINTERNAL =
IDD × VDD, where IDD is the
current required to run the chip alone, without driving any load on
the output pins.
- Derated Power is
calculated as follows: PDER = PDMAX
(TJ-TA)/θJA, where TA
is the ambient temperature and TJ is the junction
temperature.
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