Datasheet
PowerPC 970FX RISC Microprocessor
3. Electrical and Thermal Characteristics
This section provides alternating current (ac) and direct current (dc) electrical specifications and thermal char-
acteristics for the PowerPC 970FX.
3.1 dc Electrical Characteristics
The tables in this section describe the PowerPC 970FX RISC Microprocessor dc electrical characteristics.
3.1.1 Absolute Maximum Ratings
Table 3-1. Absolute Maximum Ratings
Characteristic
Core supply voltage
Symbol
Value
Unit
V
Notes
1, 3
1, 3
1, 3
1, 2
1
V
-0.3 to 1.5
-0.3 to 1.7
-0.3 to 3.0
-0.3 to 1.7
-40 to 125
DD
I/O supply voltage
OV
V
DD
DD
IN
Phase-locked loop (PLL) supply voltage
Input voltage
AV
V
V
V
Storage temperature range
T
°C
STG
1. Functional and tested operating conditions are given in Table 3-2. Recommended Operating Conditions on page 21. Absolute
maximum ratings are stress ratings only, and functional operation at the maximums is not guaranteed. Stresses beyond those
listed might affect device reliability or cause permanent damage to the device.
2. This is an implied dc voltage specification. Pending further evaluation, an allowance for ac overshoot or undershoot might be
accommodated beyond this input voltage specification.
3. Power supply ramping recommendations:
The order does not matter if the supplies reach their final destination in 50 ms.
V
cannot exceed OV by more than 0.8 V (except for 50 ms during power on or off, where it is allowed to be ≤ 1.35 V).
DD
DD
OV cannot exceed V by more than 0.8 V (except for 50 ms during power on or off, where it is allowed to be ≤ 1.55 V).
AV cannot exceed V by more than 2.5 V (except for 50 ms during power on or off, where it is allowed to be ≤ 2.75 V).
DD
DD
DD
DD
3.1.2 Recommended Operating Conditions
Table 3-2. Recommended Operating Conditions (Page 1 of 2)
Characteristic
Symbol
Value
Unit
V
Notes
See Table 3-5 and
Table 3-7 on
page 26.
Core supply voltage
PLL supply voltage
V
DD
AV
2.80 50 mV
20
V
mA
V
1
DD
PLL supply current, maximum
I/O supply voltage
Notes:
AI
DD
OV
1.5 50 mV
DD
1. The PLL supply voltage has been adjusted to account for the maximum possible dc drop across the filter circuit. See Section 5.3
PLL Power Supply Filtering on page 66.
2. This is the maximum I/O current. As noted in Table 3-7 Power Consumption Throttle Back F/2 on page 26, the actual I/O power
varies between 1 - 3 watts based on the speed of the processor interface (PI) and whether the on-board termination is used. Typi-
cally it is active, but in cases of the slower parts and layouts with parts in very close proximity, signal analysis might show that the
PI terminations can be turned off.
Version 2.5
Electrical and Thermal Characteristics
Page 21 of 78
March 26, 2007
IBM [ IBM ]
