Data Sheet
PowerPC 970FX
Preliminary
3.1.2 Recommended Operating Conditions
Table 3-2. Recommended Operating Conditions
Characteristic
Symbol
Value
Unit
V
Notes
see Table 3-5,
Table 3-6, Table 3-
7 and Table 3-8
Core supply voltage
V
DD
PLL supply voltage
I/O supply voltage
Input voltage
AV
OV
2.775 ± 75mV
1.5 ± 50mV
V
V
V
DD
DD
IN
V
GND to OV
DD
3.1.3 Package Thermal Characteristics
Table 3-3. Package Thermal Characteristics
Characteristic
Symbol
Value
0.1
Unit
°C/W
°C/W
CBGA thermal conductance to back of die
CBGA thermal conductance to board
θ
JC
θ
5.4
JB
3.1.4 DC Electrical Specifications
Table 3-4. DC Electrical Specifications
Voltage
Characteristic
Symbol
Unit
Notes
Minimum
Maximum
OV + 0.3
SYSCLK, SYSCLK input high voltage
SYSCLK, SYSCLK input low voltage
Elastic Input (EI) input high voltage
—
—
0.7 x OV
-0.3
V
V
V
1
1
2
DD
DD
0.3 x OV
DD
VIH
(0.5 x OV ) + 0.2
DD
—
Notes: See Table 3-2 on page 18 for recommended operating conditions.
1. SYSCLK differential receiver requires HSTL differential signaling level. See the JEDEC HSTL standard.
2. See the PowerPC 970FX Users Manual, Electrical Interface section. Minimum input must meet the EYE OPENING
REQUIREMENTS of the link.
3. The JTAG signals TDI, TMS, and TRST do not have internal pullups; therefore, pullup must be added on the board. Pullups
should be added and adjusted according to the system implementation. These input/outputs meet the DC specification in the
JEDEC standard JESD8-11 for 1.5V Normal Power Supply Range.
4. A 100Ω split terminator is the test load. Note a 40Ω driver has an up level of 0.78 x OV for V
and 0.22 x OV at V
.
DD
OH
DD
OL
5. There are two open drain signals on this type of driver: CHKSTOP and I2CGO. The pullup for these nets depend on the t
rise
time requirement, net load, and topology. The following are two bounding suggestions based on a point-to-point 50Ω net with
two lengths (5cm and 61cm). A 33Ω series source terminator was added in both runs. A net of 61cm or 24 inches is
recommended.
Examples:
500Ω Pullup DC Low Level 0.18V @ Receiver
Trise 0.2V - 0.8V = 55ns @ 61cm
Trise 0.2V - 0.8V = 10ns @ 5cm
1KΩ Pullup DC Low Level 0.13V @ Receiver
Trise 0.2V - 0.8V = 115ns @ 61cm
Trise 0.2V - 0.8V = 20ns @ 5cm
6. Capacitance values are guaranteed by design and characterization, and are not tested.
Electrical and Thermal Characteristics
October 14, 2005
Page 18 of 74
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