MPC7455 RISC Microprocessor Hardware Specifications, Rev. 4.1
Freescale Semiconductor
15
Electrical and Thermal Characteristics
5.2 AC Electrical Characteristics
This section provides the AC electrical characteristics for the MPC7455. After fabrication, functional parts are
sorted by maximum processor core frequency as shown in
Section 5.2.1, “Clock AC Specifications
,”
and tested for
conformance to the AC specifications for that frequency. The processor core frequency is determined by the bus
(SYSCLK) frequency and the settings of the PLL_CFG[0:4] signals. Parts are sold by maximum processor core
frequency; see
Section 11, “Ordering Information.
”
5.2.1 Clock AC Specifications
Table 8
provides the clock AC timing specifications as defined in
Figure 3
.
Typical
7.6
7.6
7.6
7.6
W
1, 3
Deep Sleep Mode (PLL Disabled)
Typical
7.3
7.3
7.3
7.3
W
1, 3
Notes:
1. These values apply for all valid processor bus and L3 bus ratios. The values do not include I/O supply power (OV
DD
and GV
DD
) or PLL supply power (AV
DD
). OV
DD
and GV
DD
power is system dependent, but is typically <5% of V
DD
power. Worst case power consumption for AV
DD
< 3 mW.
2. Maximum power is measured at nominal V
DD
(see
Table 4
) while running an entirely cache-resident, contrived
sequence of instructions which keep the execution units, with or without AltiVec, maximally busy.
3. Typical power is an average value measured at the nominal recommended V
DD
(see
Table 4
) and 65
°
C in a system
while running a typical code sequence.
4. Doze mode is not a user-definable state; it is an intermediate state between full-power and either nap or sleep mode.
As a result, power consumption for this mode is not tested.
Table 8. Clock AC Timing Specifications
At recommended operating conditions. See
Table 4
.
Characteristic
Symbol
Maximum Processor Core Frequency
Unit
Notes
733 MHz
867 MHz
933 MHz
1 GHz
Min
Max
Min
Max
Min
Max
Min
Max
Processor frequency
f
core
500
733
500
867
500
933
500
1000
MHz
1
VCO frequency
f
VCO
1000
1466
1000
1734
1000
1866
1000
2000
MHz
1
SYSCLK frequency
f
SYSCLK
33
133
33
133
33
133
33
133
MHz
1
SYSCLK cycle time
t
SYSCLK
7.5
30
7.5
30
7.5
30
7.5
30
ns
SYSCLK rise and fall time
t
KR
, t
KF
—
1.0
—
1.0
—
1.0
—
1.0
ns
2
SYSCLK duty cycle
measured at OV
DD
/2
t
KHKL
/
t
SYSCLK
40
60
40
60
40
60
40
60
%
3
Table 7. Power Consumption for MPC7455 (continued)
Processor (CPU) Frequency
Unit
Notes
733 MHz
867 MHz
933 MHz
1 GHz