參數(shù)資料
型號： MPC8377EVRANGA
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 400 MHz, MICROPROCESSOR, PBGA689
封裝： 31 X 31 MM, 2.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-689
文件頁數(shù)： 2/124頁
文件大?。?/td> 1462K
代理商： MPC8377EVRANGA
MPC8377E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2
10
Freescale Semiconductor
Electrical Characteristics
2.1.3
Output Driver Characteristics
Table 4 provides information on the characteristics of the output driver strengths. The values are
preliminary estimates.
2.2
Power Sequencing
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 (VDD and AVDD) before the I/O voltages and
assert PORESET before the power supplies fully ramp up. VDD and AVDD must reach 90% of their
nominal value before GVDD, LVDD, and OVDD reach 10% of their value, see Figure 3. I/O voltage
supplies, GVDD, LVDD, and OVDD do not have any ordering requirements with respect to one another.
Figure 3. Power-Up Sequencing Example
Table 4. Output Drive Capability
Driver Type 1
1
Specialized SerDes output capabilities are described in the relevant sections of these specifications (such as PCI Express and
SATA)
Output Impedance (
Ω)
Supply Voltage
Local bus interface utilities signals
45
LBVDD = 2.5 V, 3.3 V
40
LBVDD = 1.8 V
PCI signals
25
OVDD = 3.3 V
DDR1 signal
18
GVDD = 2.5 V
DDR2 signal
18
GVDD = 1.8 V
eTSEC 10/100/1000 signals
45
LVDD = 2.5 V, 3.3 V
DUART, system control, I2C, JTAG, SPI, and USB
45
OVDD = 3.3 V
GPIO signals
45
OVDD = 3.3 V
t
90%
V
Core Voltage (VDD, AVDD)
I/O Voltage (GVDD, LVDD, and OVDD)
0
0.7 V
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