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MPC8555CPXAPE Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc

Part # MPC8555CPXAPE
Description  PowerQUICC??III Integrated Communications Processor Hardware Specifications
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8555CPXAPE Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc

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MPC8555E PowerQUICC™ III Integrated Communications Processor Hardware Specifications, Rev. 4
10
Freescale Semiconductor
Electrical Characteristics
2.1.2
Power Sequencing
The MPC8555Erequires its power rails to be applied in a specific sequence in order to ensure proper device
operation. These requirements are as follows for power up:
1. VDD, AVDDn
2. GVDD, LVDD, OVDD (I/O supplies)
Items on the same line have no ordering requirement with respect to one another. Items on separate lines
must be ordered sequentially such that voltage rails on a previous step must reach 90 percent of their value
before the voltage rails on the current step reach ten percent of theirs.
NOTE
If the items on line 2 must precede items on line 1, please ensure that the
delay will not exceed 500 ms and the power sequence is not done greater
than once per day in production environment.
NOTE
From a system standpoint, if the I/O power supplies ramp prior to the VDD
core supply, the I/Os on the MPC8555E may drive a logic one or zero during
power-up.
2.1.3
Recommended Operating Conditions
Table 2 provides the recommended operating conditions for the MPC8555E. Note that the values in
Table 2 are the recommended and tested operating conditions. Proper device operation outside of these
conditions is not guaranteed.
Table 2. Recommended Operating Conditions
Characteristic
Symbol
Recommended Value
Unit
Core supply voltage
VDD
1.2 V ± 60 mV
1.3 V± 50 mV (for 1 GHz only)
V
PLL supply voltage
AVDD
1.2 V ± 60 mV
1.3 V ± 50 mV (for 1 GHz only)
V
DDR DRAM I/O voltage
GVDD
2.5 V ± 125 mV
V
Three-speed Ethernet I/O voltage
LVDD
3.3 V ± 165 mV
2.5 V ± 125 mV
V
PCI, local bus, DUART, system control and power management,
I2C, and JTAG I/O voltage
OVDD
3.3 V ± 165 mV
V


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