NXP Semiconductors MPC5746R - Page 4

MPC5746R Hardware Design Guide, Rev. 1
Power Supply
NXP Semiconductors4
Some of the supplies can be powered with different supply voltages. In particular, the MCU allows
flexibility in the supply of voltages that power selected input and output pins. These supplies are “high”
supplies and can be connected to either a nominal 3.3 V or 5.0 V supply. In addition we recommend
keeping all supply slew rates below 25 V/ms.
Refer to the MPC5746R Data Sheet to learn what voltages can be connected to the power pins. Supply
pins/balls differ from package to package. Please refer to section 3.1.1 for package differences.
The following table shows several power supply design schemes. The flexibility of the supply
configurations provides the board designer several options for optimizing the design.
Please refer to the IO description attached to the MPC5746R Reference Manual for more details.
3.1.1 Power supply package differences
There are different numbers of balls/pins available for the power supplies in each of the MPC5746R
package options. In addition, for some package options, some power supplies are not available. The table
below shows, for each package, the number of balls available for the power supply input to the device.
All supply balls that are available on the package should be connected to a supply voltage.
Table 4. Power supply schemes
Supply options Reference
Single 5 V supply Section
3.1.2
Multi supply with 5 V and 3.3 V Section 3.1.3
Multi supply with 5 V and 1.25 V Section 3.1.4
Table 5. Number of power supply balls/pins versus package
Supply Domain Nominal Voltage 144LQFP 176LQFP 252BGA
VDD_LV
1
1.25 V 6 6 14
VDD_HV_IO_MAIN 5.0 V 5 5 7
VDD_HV_ADV_SAR 5.0 V 1 1 2
VDD_HV_ADR_SAR 5.0 V 1 1 1
VDD_HV_ADV_SD 5.0 V 1 1 1
VDD_HV_ADR_SD 5.0 V 1 1 1
VDD_HV_IO_JTAG 3.3 V or 5.0 V 1 1 1
VDD_HV_IO_FEC 3.3 V or 5.0 V 1 1 1
VDD_HV_IO_MSC 3.3 V or 5.0 V 1 1 1
VDD_HV_PMC 5.0 V 1 1 1
VDD_HV_FLA
2
3.3 V 1 1 1
VDD_LV_BD
3
1.25 V - - -