参数资料
型号: MPC8308-SOM
厂商: Freescale Semiconductor
文件页数: 45/83页
文件大小: 0K
描述: MODULE BOARD FOR MPC8308
标准包装: 1
系列: PowerQUICC II™ PRO
类型: MPU
适用于相关产品: MPC8308
所含物品:
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
Freescale Semiconductor
5
Electrical Characteristics
This figure shows the undershoot and overshoot voltages at the interfaces of the device.
Figure 2. Overshoot/Undershoot Voltage for GVDD/NVDD/LVDD
2.1.3
Output Driver Characteristics
This table provides information on the characteristics of the output driver strengths.
2.1.4
Power Sequencing
It is required to apply the core supply voltage (VDD) before the I/O supply voltages (GVDD, LVDD, and
NVDD) and assert PORESET before the power supplies fully ramp up. The core voltage supply must rise
to 90% of its nominal value before the I/O supplies reach 0.7 V; see Figure 3.
If this recommendation is not observed and I/O voltages are supplied before the core voltage, there might
be a period of time that all input and output pins are actively driven and cause contention and excessive
current. To overcome side effects of this condition, the application environment may require tuning of
external pull-up or pull-down resistors on particular signals to lesser values.
Table 3. Output Drive Capability
Driver Type
Output Impedance (
)
Supply Voltage
Local bus interface utilities signals
42
NVDD = 3.3 V
DDR2 signals1
1 Output Impedance can also be adjusted through configurable options in DDR Control Driver Register (DDRCDR).
For more information, see the MPC8308 PowerQUICC II Pro Processor Reference Manual.
18
GVDD = 1.8 V
DUART, system control, I2C, JTAG, eSDHC, GPIO,SPI, USB
42
NVDD = 3.3 V
eTSEC signals
42
LVDD = 2.5/3.3 V
VSS
VSS – 0.3 V
VSS – 0.7 V
Not to Exceed 10%
G/L/NVDD + 20%
G/L/NVDD
G/L/NVDD + 5%
of tinterface
1
1. tinterface refers to the clock period associated with the bus clock interface.
VIH
VIL
Note:
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