MPC8309VMAHFCA Freescale Semiconductor, MPC8309VMAHFCA Datasheet - Page 77

• Manufacturer Part Number: MPC8309VMAHFCA
• Description: 417/333/233 MP Std Tmp
• Manufacturer: Freescale Semiconductor

Specifications of MPC8309VMAHFCA

• Processor Series: MPC8309
• Core: e300c3
• Data Bus Width: 32 bit
• Data Ram Size: 512 MB
• Interface Type: USB, CAN, UART, PCI
• Maximum Clock Frequency: 417 MHz
• Number Of Programmable I/os: 56
• Operating Supply Voltage: - 0.3 V to + 1.26 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Operating Temperature Range: 0 C to + 105 C
• Processor To Be Evaluated: MPC8309
• Supply Current (max): 5 uA
• Lead Free Status / Rohs Status: Details

to minimize inductance. Suggested bulk capacitors—100 to 330 µF (AVX TPS tantalum or Sanyo
OSCON).
25.4
For all buses, the driver is a push-pull single-ended driver type (open drain for I
To measure Z
or GND. Then, the value of each resistor is varied until the pad voltage is OV
output impedance is the average of two components, the resistances of the pull-up and pull-down devices.
When data is held high, SW1 is closed (SW2 is open) and R
OV
other in value. Then, Z
The value of this resistance and the strength of the driver’s current source can be found by making two
measurements. First, the output voltage is measured while driving logic 1 without an external differential
termination resistor. The measured voltage is V
while driving logic 1 with an external precision differential termination resistor of value R
measured voltage is V
R
Freescale Semiconductor
source
DD
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 1
/2. R
= R
Output Buffer DC Impedance
term
P
then becomes the resistance of the pull-up devices. R
0
for the single-ended drivers, an external resistor is connected from the chip pad to OV
 (V
1
/V
2
0
2
= (1/(1/R
= (R
– 1). The drive current is then I
P
+ R
Figure 47. Driver Impedance Measurement
1
Data
N
+ 1/R
)/2.
2
))  I
1
source
= R
source
. Solving for the output impedance gives
source
 I
P
Pad
R
R
source
is trimmed until the voltage at the pad equals
N
P
OGND
OV
= V
DD
P
. Second, the output voltage is measured
1
and R
/R
SW2
SW1
source
N
are designed to be close to each
.
DD
2
/2 (see
C).
System Design Information
Figure
term
. The
47). The
DD
77