Data Sheet
Preliminary
PowerPC® 750CXe RISC Microprocessor
Table 6-2 on page 29 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
30
65
50
40
30
1.70, 1.70
1.80, 1.80
1.90, 1.90
1.90, 1.90
1.70, 2.38
1.80, 2.5
105
65
0
Best
-40
105
65
0
Worst
Typical
Best
1.90, 2.62
1.90, 2.62
Best
-40
6.5.1 Input-Output Usage
Table 6-3 provides details on the input-output usage of the PowerPC 750CXe signals. The column titled
Usage Group refers to the general functional category of the signal.
In the PowerPC 750CXe, 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 33.
750cxe_DD3.1_Dev_3_gen_mkt.fm.1.5
April 8, 2004
System Design Information
Page 29 of 36
IBM [ IBM ]
