MPC5633MMLL80 datasheet(78/106 Pages) FREESCALE

78 / 106 page

MPC5634M Microcontroller Data Sheet, Rev. 8

Freescale Semiconductor

4.7

Power up/down sequencing

There is no power sequencing required among power sources during power up and power down, in order to operate within

specification but use of the following sequence is strongly recommended when the internal regulator is bypassed:

 3.3 V and 1.2 V

This is also the normal sequence when the internal regulator is enabled.

Although there are no power up/down sequencing requirements to prevent issues like latch-up, excessive current spikes, etc.,

the state of the I/O pins during power up/down varies according to table Table 17 for all pins with fast pads and Table 18 for all

pins with medium, slow and multi-voltage pads.1

1.If an external 3.3 V external regulator is used to supply current to the 1.2 V pass transistor and this supply also sup-

plies current for the other 3.3 V supplies, then the 5V supply must always be greater than or equal to the external 3.3 V

supply.

Table 17. Power sequence pin states for fast pads

VDDE

VRC33

VDD

Fast (pad_fc)

LOW

VDDE

LOW

HIGH

VDDE

VRC33

LOW

HIGH IMPEDANCE

VDDE

VRC33

VDD

FUNCTIONAL

Table 18. Power sequence pin states for medium, slow and multi-voltage pads

VDDEH

VDD

Medium (pad_msr_hv)

Slow (pad_ssr_hv)

Multi-voltage (pad_multv_hv)

LOW

VDDEH

LOW

HIGH IMPEDANCE

VDDEH

VDD

FUNCTIONAL

MPC5633MMLL80 Datasheet(PDF) 78 Page - Freescale Semiconductor, Inc

MPC5633MMLL80 Datasheet(HTML) 78 Page - Freescale Semiconductor, Inc

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