MPC755BRX300LE Freescale Semiconductor, MPC755BRX300LE Datasheet - Page 40

• Manufacturer Part Number: MPC755BRX300LE
• Description: IC MPU 32BIT 300MHZ PPC 360-CBGA
• Manufacturer: Freescale Semiconductor

Specifications of MPC755BRX300LE

• Processor Type: MPC7xx PowerPC 32-Bit
• Speed: 300MHz
• Voltage: 2V
• Mounting Type: Surface Mount
• Package / Case: 360-FCCBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

System Design Information
Figure 22
Alternately, the following is another method to determine the output impedance of the MPC755. A voltage
source, V
voltage source is set to a value that is equal to (L2)OV
The voltage drop across the pull-down device, which is equal to (L2)OV
current to determine the output impedance of the pull-down device, R
pull-up device is determined by dividing the voltage drop of the pull-up, (L2)OV
by the pull-up when the data is high and V
either empirical data from a test setup or with data from simulation models, such as IBIS.
R
Figure 23
40
P
and R
N
force
describes the driver impedance measurement circuit described above.
describes the alternate driver impedance measurement circuit.
are designed to be close to each other in value. Then Z
, is connected to the output of the MPC755 as shown in
Figure 23. Alternate Driver Impedance Measurement Circuit
MPC755 RISC Microprocessor Hardware Specifications, Rev. 8
Figure 22. Driver Impedance Measurement Circuit
Data
Data
force
is equal to (L2)OV
(L2)OV
(L2)OV
OGND
DD
DD
DD
/2 and the current sourced by V
Pad
R
R
(L2)OV
N
P
OGND
BGA
DD
Pin
DD
0
/2. This method can be employed with
= (R
SW2
SW1
Figure
N
. Similarly, the impedance of the
V
DD
P
force
+ R
/2, is divided by the measured
23. Data is held low, the
N
)/2.
DD
/2, by the current sank
Freescale Semiconductor
force
is measured.