mpc8309 Freescale Semiconductor, Inc, mpc8309 Datasheet - Page 79

• Manufacturer Part Number: mpc8309
• Description: Powerquicc Ii Pro Integrated Communications Processor Family Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Table 65
nominal OV
25.5
The MPC8309 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 k on certain output pins (Refer to the “Reset, Clocking
and Initialization” of MPC8309 PowerQUICC II Pro Integrated Communications Processor Family
Reference Manual). These pins are generally used as output only pins in normal operation.
While HRESET is asserted however, these pins are treated as inputs. The value presented on these pins
while HRESET is asserted, is latched when HRESET 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.
26 Ordering Information
This section presents ordering information for the devices discussed in this document, and it shows an
example of how the parts are marked. Ordering information for the devices fully covered by this document
is provided in
26.1
Table 66
individual part numbers correspond to a maximum processor core frequency. For available frequencies,
contact your local Freescale sales office. In addition to the maximum processor core frequency, the part
numbering scheme also includes the maximum effective DDR memory speed and QUICC Engine bus
frequency. Each part number also contains a revision code which refers to the die mask revision number.
Freescale Semiconductor
Note: Nominal supply voltages. See
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0
Impedance
Differential
R
R
summarizes the signal impedance targets. The driver impedance are targeted at minimum V
provides the Freescale part numbering nomenclature for the MPC8309 family. Note that the
N
P
Configuration Pin Multiplexing
Part Numbers Fully Addressed by This Document
DD
Section 26.1, “Part Numbers Fully Addressed by This Document.”
, 105C.
Configuration and Power Management
Local Bus, Ethernet, DUART, Control,
Table
Table 65. Impedance Characteristics
42 Target
42 Target
1, T
NA
j
= 105C.
DDR DRAM
20 Target
20 Target
NA
Symbol
Z
Z
Z
DIFF
0
0
Ordering Information
Unit
Ω
Ω
Ω
DD
79
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