mpc8378 Freescale Semiconductor, Inc, mpc8378 Datasheet - Page 10

• Manufacturer Part Number: mpc8378
• Description: Powerquicc Ii Pro Processor
• Manufacturer: Freescale Semiconductor, Inc

1
Electrical Characteristics
2.1.3
Table 4
preliminary estimates.
2.2
The device requires its power rails to be applied in a specific sequence in order to ensure proper device
operation. During the power ramp up, before the power supplies are stable and if the I/O voltages are
supplied before the core voltage, there may be a period of time that all input and output pins will actively
be driven and cause contention and excessive current. To avoid actively driving the I/O pins and to
eliminate excessive current draw, apply the core voltages (V
assert PORESET before the power supplies fully ramp up. V
nominal value before GV
supplies, GV
10
Local bus interface utilities signals
PCI signals
DDR1 signal
DDR2 signal
eTSEC 10/100/1000 signals
DUART, system control, I
GPIO signals
SATA)
Specialized SerDes output capabilities are described in the relevant sections of these specifications (such as PCI Express and
provides information on the characteristics of the output driver strengths. The values are
Power Sequencing
Output Driver Characteristics
DD
, LV
90%
MPC8377E PowerQUICC II Pro Processor Hardware Specifications, Rev. 3
V
DD
Driver Type
2
0
C, JTAG, SPI, and USB
, and OV
DD
, LV
1
DD
Figure 3. Power-Up Sequencing Example
DD
, and OV
do not have any ordering requirements with respect to one another.
Table 4. Output Drive Capability
DD
reach 10% of their value, see
I/O Voltage (GVDD, LVDD, and OVDD)
Output Impedance (Ω)
DD
DD
Core Voltage (VDD
and AV
and AV
45
40
25
18
18
45
45
45
DD
DD
) before the I/O voltages and
must reach 90% of their
0.7 V
Figure
,
AVDD)
LBV
LV
Freescale Semiconductor
Supply Voltage
3. I/O voltage
LBV
t
DD
GV
GV
OV
OV
OV
DD
= 2.5 V, 3.3 V
DD
DD
DD
DD
DD
DD
= 2.5 V, 3.3 V
= 3.3 V
= 2.5 V
= 1.8 V
= 3.3 V
= 3.3 V
= 1.8 V