MPC5200B datasheet(64/72 Pages) FREESCALE

64 / 72 page

MPC5200B Data Sheet, Rev. 3

Freescale Semiconductor

System Design Information

3.1

Power Up/Down Sequencing

Figure 51 shows situations in sequencing the I/O VDD (VDD_IO), Memory VDD (VDD_IO_MEM), PLL VDD

(PLL_AVDD), and Core VDD (VDD_CORE).

Figure 51. Supply Voltage Sequencing

VDD_MEM_IO

VDD_CORE

VSS_IO/CORE

SYS_PLL_AVDD

CORE_PLL_AVDD

1 All “open drain” outputs of the MPC5200B are actually regular three-state output drivers with the output data tied low

and the output enable controlled. Thus, unlike a true open drain, there is a current path from the external system to

the MPC5200B I/O power rail if the external signal is driven above the MPC5200B I/O power rail voltage.

Table 52. MPC5200B Pinout Listing (continued)

Name

Alias

Type

Power Supply

Output Driver

Type

Input

Type

Pull-up/

down

1.5V

2.5V

3.3V

VDD_IO,

VDD_IO_MEM (SDR)

VDD_IO_MEM (DDR)

VDD_CORE,

PLL_AVDD

Note: VDD_CORE should not exceed VDD_IO, VDD_IO_MEM or PLL_AVDD by more than 0.4 V at any time, including

power-up.

Note: It is recommended that VDD_CORE/PLL_AVDD should track VDD_IO/VDD_IO_MEM up to 0.9 V then separate

for completion of ramps.

Note: Input voltage must not be greater than the supply voltage (VDD_IO) VDD_IO_MEM, VDD_CORE, or PLL_AVDD)

by more than 0.5 V at any time, including during power-up.

Note: Use 1 microsecond or slower rise time for all supplies.

Time

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