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PPC5567MVZ112R2 Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc

Part # PPC5567MVZ112R2
Description  Microcontroller
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PPC5567MVZ112R2 Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc

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Electrical Characteristics
MPC5567 Microcontroller Data Sheet, Rev. 0
Preliminary—Subject to Change Without Notice
Freescale Semiconductor
11
Although there is no power sequencing required between VRC33 and VDDSYN during power up, for the
VRC stage turn-on to operate within specification, VRC33 must not lead VDDSYN by more than 600 mV
or lag by more than 100 mV. Higher spikes in the emitter current of the pass transistor will occur if VRC33
leads or lags VDDSYN by more than these amounts. The value of that higher spike in current depends on
the board power supply circuitry and the amount of board level capacitance.
Furthermore, when all of the PORs negate, the system clock will start to toggle, adding another large
increase of the current consumption from VRC33. If VRC33 lags VDDSYN by more than 100 mV, this
increased current consumption can drop VDD low enough to assert the 1.5-V POR again. Oscillations are
even possible because when the 1.5-V POR asserts, the system clock stops, causing the voltage on VDD
to rise until the 1.5-V POR negates again. Any oscillations stop when VRC33 is powered sufficiently.
When powering down, VRC33 and VDDSYN do not have a delta requirement to each other, because the
bypass capacitors internal and external to the device are already charged.
When not powering up or down, VRC33 and VDDSYN do not have a delta requirement to each other for
the VRC to operate within specification.
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 depending on power. Table 7
gives the pin state for the sequence cases for all pins with pad type pad_fc (fast type), and Table 8 for all
pins with pad type pad_mh (medium type) and pad_sh (slow type).
3.7.1
Power Up Sequence (If VRC33 Grounded)
In this case, the 1.5-V VDD supply must rise to 1.35-V before the 3.3-V VDDSYN and the RESET power
supplies rises above 2.0 V. This ensures that digital logic in the PLL on the 1.5-V supply will not begin to
operate below the specified operation range lower limit of 1.35 V. Since the internal 1.5-V POR is disabled,
Table 7. Power Sequence Pin States (Fast Pads)
VDDE
VDD33
VDD
pad_fc (Fast)
Output Driver
State
Comment
LOW
X
X
Low
Functional I/O pins are clamped to VSS and VDDE
VDDE
LOW
X
High
VDDE
VDD33
LOW
High Impedance
POR asserted.
VDDE
VDD33
VDD
Functional
No POR asserted
Table 8. Power Sequence Pin States (Medium and Slow Pads)
VDDEH
VDD
pad_mh/pad_sh
(Medium and Slow)
Output Driver
Comment
LOW
X
Low
Functional I/O pins are clamped to VSS and VDDEH
VDDEH
LOW
High Impedance
POR asserted
VDDEH
VDD
Functional
No POR asserted


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