mpc755ed Freescale Semiconductor, Inc, mpc755ed Datasheet - Page 7

• Manufacturer Part Number: mpc755ed
• Description: Risc Microprocessor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Figure 2
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
provided through separate sets of supply pins and may be provided at the voltages shown in
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 OV
pins.
Table 2
Freescale Semiconductor
Caution: The input threshold selection must agree with the OV
Note: The input threshold settings above are different for all revisions prior to Rev. 2.8 (Rev. E). For more information,
refer to
Revision
for actual recommended core voltage). Voltage to the L2 I/Os and processor interface I/Os are
describes the input threshold voltage setting.
Part
shows the allowable undershoot and overshoot voltage on the MPC755.
E
Section 10.2, “Part Numbers Not Fully Addressed by This Document.”
BVSEL Signal
(L2)OV
(L2)OV
GND – 0.3 V
GND – 0.7 V
MPC755 RISC Microprocessor Hardware Specifications, Rev. 8
0
1
DD
(L2)OV
DD
+ 20%
V
+ 5%
V
GND
IH
IL
DD
Figure 2. Overshoot/Undershoot Voltage
Table 2. Input Threshold Voltage Setting
Interface Voltage
Processor Bus
Not Available
2.5 V/3.3 V
Not to Exceed 10%
of t
DD
SYSCLK
/L2OV
L2VSEL Signal
DD
voltages supplied.
0
1
Electrical and Thermal Characteristics
DD
Interface Voltage
Not Available
or L2OV
2.5 V/3.3 V
L2 Bus
Table
DD
power
2. The
7