mpc8314e Freescale Semiconductor, Inc, mpc8314e Datasheet - Page 11

• Manufacturer Part Number: mpc8314e
• Description: Powerquicc Ii Pro Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

before the core voltage, there may be a period of time when all input and output pins be actively driven
and cause contention and/or excessive current. In order to avoid actively driving the I/O pins and to
eliminate excessive current draw, apply the continuous core voltage (VDDC) before the continuous I/O
voltages (LVDDx_ON and NVDDx_ON) and switchable core voltage (VDD) before the switchable I/O
voltages (GVDD, LVDDx_OFF, and NVDDx_OFF). PORESET should be asserted before the continuous
power supplies fully ramp up. In the case where the core voltage is applied first, the core voltage supply
must rise to 90% of its nominal value before the I/O supplies reach 0.7 V, see
supplies are stable, wait for a minimum of 32 clock cycles before negating PORESET.
The I/O power supply ramp-up slew rate should be slower than 4V/100
circuit
Figure 3
When switching from normal mode to D3 warm (standby) mode, first turn off the switchable I/O voltage
supply and then turn off the switchable core voltage supply. Similarly, when switching from D3 warm
(standby) mode to normal mode, first turn on the switchable core voltage supply and then turn on the
switchable I/O voltage supply.
Freescale Semiconductor
90%
V
.
Power sequence for continuous power supplies
shows the power-up sequencing for switchable and continuous supplies.
When the device is in D3 warm (standby) mode, all external voltage
supplies applied to any I/O pins, with the exception of wake-up pins, must
be turned off. Applying supplied external voltage to any I/O pins, except the
wake up pins, while the device is in D3 warm standby mode may cause
permanent damage to the device.
MPC8314E PowerQUICC
Continuous I/O Voltage
Continuous Core Voltage
Figure 3. Power-Up Sequencing
0.7 V
t
™
II Pro Processor Hardware Specifications, Rev. 0
CAUTION
90%
V
Power sequence for switchable power supplies
μ
s, this requirement is for ESD
Figure
Switchable I/O Voltage
Switchable Core Voltage (VDD)
3. Once all the power
Electrical Characteristics
0.7 V
t
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