Table 3 provides th e package th erm al ch aracteristics for th e PPC740 an d PPC750.
Table 3. Package Thermal Characteristics
Characteristic
Symbol
Value
Unit
CBGA package thermal resistance, junction-to-case thermal
resistance (typical)
θ
0.03
°C/W
JC
CBGA package thermal resistance, junction-to-lead thermal
resistance (typical)
θ
3.8
°C/W
JB
Note: Refer to Section 8.7, “Thermal Management Information“ for more information about thermal
management
Th e PPC740 an d PPC750 in corporate a th erm al m an agem en t assist u n it (TAU) com -
posed of a th erm al sen sor, digital-to-an alog con verter, com parator, con trol logic, an d
TM
TM
dedicated special-pu rpose registers (SPRs). See th e Pow erPC 740
Pow erPC 750
RISC Microproces s or Us er’s Ma nua l for m ore in form ation on th e u se of th is featu re.
Specification s for th e th erm al sen sor portion of th e TAU are fou n d in Table 4.
Table 4. Thermal Sensor Specifications
Operating conditions are specified in Section Table 2., "Recommended Operating Conditions"
Num
Characteristic
Min
Max
Unit
Notes
°C
1
2
3
Temperature range
0
128
1
2
3
—
—
Comparator settling time
Resolution
20
4
µs
°C
Notes:
1.The temperature is the junction temperature of the die. The thermal assist unit's (TAU) raw output does
not indicate an absolute temperature, but it must be interpreted by software to derive the absolute
junction temperature. For information on how to use and calibrate the TAU, contact your local IBM
sales office. This specification reflects the temperature span supported by the design.
2. The comparator settling time value must be converted into the number of CPU clocks that need to be
written into the THRM3 SPR.
3. This value is guaranteed by design and is not tested.
Table 5 provides DC electrical ch aracteristics for th e PPC740 an d PPC750.
Table 5. DC Electrical Specifications
Operating conditions are specified in Section Table 2., "Recommended Operating Conditions"
Characteristic
Symbol
Min
Max
Unit
Notes
Input high voltage (all inputs except SYSCLK)
Input low voltage (all inputs except SYSCLK)
SYSCLK input high voltage
V
2.0
3.465
V
V
V
V
1,2
IH
V
IL
GND
2.4
0.8
CV
OVdd
0.4
1
IH
IL
SYSCLK input low voltage
CV
GND
PPC740 and PPC750 Hardware Specifications
7 of 44
Preliminary and subject to change without notice
IBM [ IBM ]
