Refer to the PDF data sheet for device specific package drawings
The power down sequence is the exact reverse of the power-up sequence described above. The goal is to prevent a large amount of static current and to prevent overstress of the device. A power-good circuit that monitors all the supplies for the device should be used in all designs. If a catastrophic power supply failure occurs on any voltage rail, POR should transition to low to prevent overcurrent conditions that could possibly impact device reliability.
A system power monitoring solution is needed to shut down power to the board if a power supply fails. Long-term exposure to an environment in which one of the power supply voltages is no longer present will affect the reliability of the device. Holding the device in reset is not an acceptable solution because prolonged periods of time with an active reset can also affect long term reliability.