Power Characteristics
2.1.4 Output Driver Characteristics
Table 3 provides information on the characteristics of the output driver strengths. The values are
preliminary estimates.
Table 3. Output Drive Capability
Driver Type
Programmable
Output Impedance
(Ω)
Supply
Voltage
Notes
Local bus interface utilities signals
25
42 (default)
OVDD = 3.3 V
1
PCI signals
25
2
42 (default)
DDR signal
TSEC/10/100 signals
DUART, system control, I2C, JTAG
RapidIO N/A (LVDS signaling)
20
GVDD = 2.5 V
42
LVDD = 2.5/3.3 V
42
OVDD = 3.3 V
N/A
Notes:
1. The drive strength of the local bus interface is determined by the configuration of the appropriate bits in
PORIMPSCR.
2. The drive strength of the PCI interface is determined by the setting of the PCI_GNT1 signal at reset.
3 Power Characteristics
The estimated power dissipation on the VDD supply for the MPC8540 is shown in Table 4.
Table 4. MPC8540 VDD Power Dissipation 1,2
CCB Frequency
(MHz)
Core
Frequency (MHz)
Typical Power3,4
Maximum
Power5
Unit
200
400
4.6
7.2
W
500
4.9
7.5
600
5.3
7.9
267
533
5.5
8.2
W
667
5.9
8.7
800
6.4
10.2
MPC8540 Integrated Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
11