Data Sheet
Preliminary
PowerPC® 750CXr RISC Microprocessor
Table 6-2 on page 37 summarizes the impedance a board designer would design to for a typical process.
Table 6-2. Driver Impedance Characteristics
Process
Worst
Typical
Best
60x Impedance (Ω)
V
, OV (V)
Temperature (°C)
DD
DD
65
50
40
65
50
40
1.8, 1.8
1.85, 1.85
1.90, 1.90
1.8, 2.38
1.85, 2.5
1.90, 2.62
95
65
0
Worst
Typical
Best
95
65
0
6.5.1 Input-Output Usage
Table 6-3 provides details on the input-output usage of the PowerPC 750CXr signals. The column titled
Usage Group refers to the general functional category of the signal.
In the PowerPC 750CXr, certain input-output signals have pull-ups and pull-downs, which may or may not be
enabled. The column titled I/O with Internal Resistors defines which signals have these pull-ups or pull-
downs, and their active or inactive state.
The column titled “Level Protect” defines which signals have the designated function added to their I/O cell.
For more information, see Section 6.7.1 “Level Protection,” on page 41.
750cxr_DD4.0_Dev_gen_4_mkt.fm
February 28, 2005
System Design Information
Page 37 of 43
IBM [ IBM ]
