MPC8541ECVTALF Freescale Semiconductor, MPC8541ECVTALF Datasheet - Page 77

• Manufacturer Part Number: MPC8541ECVTALF
• Description: IC MPU POWERQUICC III 783-FCPBGA
• Manufacturer: Freescale Semiconductor

Specifications of MPC8541ECVTALF

• Processor Type: MPC85xx PowerQUICC III 32-Bit
• Speed: 667MHz
• Voltage: 1.2V
• Mounting Type: Surface Mount
• Package / Case: 783-FCPBGA
• For Use With: MPC8548CDS - DEV TOOLS CDS FOR 8548CWH-PPC-8540N-VE - KIT EVAL SYSTEM MPC8540
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

Figure 49
17.3
Due to large address and data buses, and high operating frequencies, the MPC8541E can generate transient
power surges and high frequency noise in its power supply, especially while driving large capacitive loads.
This noise must be prevented from reaching other components in the MPC8541E system, and the
MPC8541E itself requires a clean, tightly regulated source of power. Therefore, it is recommended that
the system designer place at least one decoupling capacitor at each V
of the MPC8541E. These decoupling capacitors should receive their power from separate V
GV
Capacitors may be placed directly under the device using a standard escape pattern. Others may surround
the part.
These capacitors should have a value of 0.01 or 0.1 µF. Only ceramic SMT (surface mount technology)
capacitors should be used to minimize lead inductance, preferably 0402 or 0603 sizes.
In addition, it is recommended that there be several bulk storage capacitors distributed around the PCB,
feeding the V
capacitors. These bulk capacitors should have a low ESR (equivalent series resistance) rating to ensure the
quick response time necessary. They should also be connected to the power and ground planes through two
vias to minimize inductance. Suggested bulk capacitors—100–330 µF (AVX TPS tantalum or Sanyo
OSCON).
17.4
To ensure reliable operation, it is highly recommended to connect unused inputs to an appropriate signal
level. Unused active low inputs should be tied to OV
inputs should be connected to GND. All NC (no-connect) signals must remain unconnected.
Power and ground connections must be made to all external V
the MPC8541E.
17.5
The MPC8541E drivers are characterized over process, voltage, and temperature. 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.
Freescale Semiconductor
DD
, LV
MPC8541E PowerQUICC™ III Integrated Communications Processor Hardware Specification, Rev. 4.2
Connection Recommendations
Decoupling Recommendations
Output Buffer DC Impedance
shows the PLL power supply filter circuit.
DD
DD
, and GND power planes in the PCB, utilizing short traces to minimize inductance.
0
for the single-ended drivers, an external resistor is connected from the chip pad to OV
, OV
V
DD
DD
, GV
DD
Figure 49. PLL Power Supply Filter Circuit
, and LV
10 Ω
DD
2.2 µF
planes, to enable quick recharging of the smaller chip
GND
DD
Low ESL Surface Mount Capacitors
, GV
2
C).
2.2 µF
DD
DD
, or LV
, GV
AV
DD
DD
DD
DD
, LV
, OV
(or L2AV
as required. Unused active high
DD
DD
DD
, OV
, GV
DD
/2 (see
)
System Design Information
DD
DD
, and GND pins of
, and LV
Figure
DD
, OV
50). The
DD
pins
DD
DD
,
77