参数资料
型号: MPC8349ECVVAGFB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA672
封装: 35 X 35 MM, 1.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, TBGA-672
文件页数: 87/87页
文件大小: 1037K
代理商: MPC8349ECVVAGFB
MPC8349EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 12
Freescale Semiconductor
9
Electrical Characteristics
Figure 3 shows the undershoot and overshoot voltage of the PCI interface of the MPC8349EA for the
3.3-V signals, respectively.
Figure 3. Maximum AC Waveforms on PCI Interface for 3.3-V Signaling
2.1.3
Output Driver Characteristics
Table 3 provides information on the characteristics of the output driver strengths. The values are
preliminary estimates.
2.2
Power Sequencing
The device does not require the core supply voltage and I/O supply voltages to be applied in any particular
order. Note that during the power ramp up, before the power supplies are stable, there may be a period of
time that I/O pins are actively driven. After the power is stable, as long as PORESET is asserted, most I/O
pins are three-stated. To minimize the time that I/O pins are actively driven, it is recommended to apply
core voltage before I/O voltage and assert PORESET before the power supplies fully ramp up.
Table 3. Output Drive Capability
Driver Type
Output Impedance
(
Ω)
Supply
Voltage
Local bus interface utilities signals
40
OVDD = 3.3 V
PCI signals (not including PCI output clocks)
25
PCI output clocks (including PCI_SYNC_OUT)
40
DDR signal
18
GVDD = 2.5 V
DDR2 signal
18
36 (half-strength mode)
GVDD = 1.8 V
TSEC/10/100 signals
40
LVDD = 2.5/3.3 V
DUART, system control, I2C, JTAG, USB
40
OVDD = 3.3 V
GPIO signals
40
OVDD = 3.3 V,
LVDD = 2.5/3.3 V
Undervoltage
Waveform
Overvoltage
Waveform
11 ns
(Min)
+7.1 V
7.1 V p-to-p
(Min)
4 ns
(Max)
–3.5 V
7.1 V p-to-p
(Min)
62.5 ns
+3.6 V
0 V
4 ns
(Max)
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