MPC8308-RDB Freescale Semiconductor, MPC8308-RDB Datasheet - Page 85

• Manufacturer Part Number: MPC8308-RDB
• Description: BOARD REF DESIGN MPC8308
• Manufacturer: Freescale Semiconductor
• Series: PowerQUICC II™ PROr
• Type: MPUr

Specifications of MPC8308-RDB

• Contents: Board, Cables, Documentation, Power Supply, Software
• Ethernet Connection Type: Serial to Ethernet
• Data Rate: 10 Mbps, 100 Mbps, 1000 Mbps
• Memory Type: DDR2, SDRAM
• Interface Type: HSSI
• Operating Voltage: 1.5 V
• Operating Current: 5 uA
• Maximum Power Dissipation: 1000 mW
• Operating Temperature Range: - 55 C to + 125 C
• Product: Modules
• For Use With/related Products: MPC8308
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
Table 60
nominal NV
23.6
The device provides the user with power-on configuration options which can be set through the use of
external pull-up or pull-down resistors of 4.7 KΩ on certain output pins (see customer visible
configuration pins). These pins are generally used as output only pins in normal operation.
While PORESET is asserted however, these pins are treated as inputs. The value presented on these pins
while PORESET is asserted, is latched when PORESET deasserts, at which time the input receiver is
disabled and the I/O circuit takes on its normal function. Careful board layout with stubless connections
to these pull-up/pull-down resistors coupled with the large value of the pull-up/pull-down resistor should
minimize the disruption of signal quality or speed for output pins thus configured.
Freescale Semiconductor
term
× (V
summarizes the signal impedance targets. The driver impedance are targeted at minimum V
Note: Nominal supply voltages. See
Configuration Pin Muxing
Impedance
1
/V
DD
2
R
R
, 105°C.
N
P
– 1). The drive current is then I
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2
2
= (1/(1/R
Local Bus, Ethernet, DUART, Control,
Configuration, Power Management
Figure 55. Driver Impedance Measurement
1
Data
+ 1/R
Table 60. Impedance Characteristics
Table
2
42 Target
42 Target
)) × I
2, T
1
source
source
= R
j
= 105°C.
source
. Solving for the output impedance gives R
= V
1
× I
/R
Pad
R
source
R
source
NV
N
P
VSS
DD
. Second, the output voltage is measured
.
SW2
SW1
DDR DRAM
20 Target
20 Target
Symbol
Z
Z
System Design Information
0
0
term
Unit
Ω
Ω
. The
source
=
DD
85
,