參數(shù)資料
型號: MPC745BPX350LE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 350 MHz, RISC PROCESSOR, PBGA255
封裝: 21 X 21 MM, 2.80 MM HEIGHT, 1.27 MM PITCH, PLASTIC, BGA-255
文件頁數(shù): 58/60頁
文件大?。?/td> 1559K
代理商: MPC745BPX350LE
MPC755 RISC Microprocessor Hardware Specifications, Rev. 7.0
Freescale Semiconductor
7
Electrical and Thermal Characteristics
Figure 2 shows the allowable undershoot and overshoot voltage on the MPC755.
Figure 2. Overshoot/Undershoot Voltage
The MPC755 provides several I/O voltages to support both compatibility with existing systems and
migration to future systems. The MPC755 core voltage must always be provided at nominal 2.0 V (see
Table 3 for actual recommended core voltage). Voltage to the L2 I/Os and processor interface I/Os are
provided through separate sets of supply pins and may be provided at the voltages shown in Table 2. The
input voltage threshold for each bus is selected by sampling the state of the voltage select pins BVSEL and
L2VSEL during operation. These signals must remain stable during part operation and cannot change. The
output voltage will swing from GND to the maximum voltage applied to the OVDD or L2OVDD power
pins.
Table 2 describes the input threshold voltage setting.
Table 2. Input Threshold Voltage Setting
Part
Revision
BVSEL Signal
Processor Bus
Interface Voltage
L2VSEL Signal
L2 Bus
Interface Voltage
E
0
Not Available
0
Not Available
1
2.5 V/3.3 V
1
2.5 V/3.3 V
Caution: The input threshold selection must agree with the OVDD/L2OVDD voltages supplied.
Note: The input threshold settings above are different for all revisions prior to Rev. 2.8 (Rev. E). For more information,
VIH
GND
GND – 0.3 V
GND – 0.7 V
Not to Exceed 10%
(L2)OVDD + 20%
VIL
(L2)OVDD
(L2)OVDD + 5%
of tSYSCLK
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