參數(shù)資料
型號: MPC8377EWLANB
廠商: Freescale Semiconductor
文件頁數(shù): 2/127頁
文件大?。?/td> 0K
描述: ACCESS POINT/ROUTER MPC8377
標準包裝: 1
MPC8377E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
10
Freescale Semiconductor
2.1.3
chip
Output Driver Characteristics
This table 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 the following figure. I/O
Table 4. Output Drive Capability
Driver Type1
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
Note:
1. Specialized SerDes output capabilities are described in the relevant sections of these specifications (such as PCI Express
and SATA)
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