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参数资料
型号： MPC8308VMAGDA
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： RISC MICROCONTROLLER, PBGA473
封装： 19 X 19 MM, 1.39 MM HEIGHT, 0.80 MM PITCH, LEAD FREE, PLASTIC, MABGA-473
文件页数： 45/90页
文件大小： 1123K
代理商： MPC8308VMAGDA
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2
Freescale Semiconductor
5
Electrical Characteristics
Figure 2 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
Table 3 provides information on the characteristics of the output driver strengths.
2.1.4
Power Sequencing
The device does not require the core supply voltage (VDD) and IO supply voltages (GVDD, LVDD, and
NVDD) to be applied in any particular order. Note that during power ramp-up, before the power supplies
are stable and if the 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. In order to avoid
actively driving the I/O pins and to eliminate excessive current draw, apply the core voltage (VDD) before
the I/O voltage (GVDD, LVDD, and NVDD) and assert PORESET before the power supplies fully ramp up.
In the case where the core voltage is applied first, the core voltage supply must rise to 90% of its nominal
value before the I/O supplies reach 0.7 V; see Figure 3.
Table 3. Output Drive Capability
Driver Type
Output Impedance (
Ω)
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. Note that tinterface refers to the clock period associated with the bus clock interface.
VIH
VIL
Note:
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