MSC7115 Motorola Semiconductor Products, MSC7115 Datasheet - Page 44

• Manufacturer Part Number: MSC7115
• Manufacturer: Motorola Semiconductor Products

Hardware Design Considerations
3.2.2.5
The power-up sequence is as follows:
Note:
The power-down sequence is as follows:
Use the following guidelines:
Note:
44
1.
2.
3.
4.
1.
2.
3.
4.
•
•
•
Turn on the V
Turn on the V
Turn on the V
Turn on the V
Make sure that the time interval between the ramp-up of V
Turn off the V
Turn off the V
Turn off the V
Turn of the V
Make sure that the time interval between the ramp-down of V
Make sure that the time interval between the ramp-up or ramp-down for V
power-up and power-down.
Refer to Figure 30 for relative timing for power sequencing case 5.
Cases 1, 2, 3, and 4 are recommended for system design. Designs that use Case 5 may have large current spikes on
the V
the potential current spikes. Verify risks related to current spikes using actual information for the specific application.
DDM
Case 5 (not recommended for new designs)
<10 ms
Ramp-up
supply at startup and is not recommended for most designs. If a design uses case 5, it must accommodate
DDIO
DDIO
DDM
DDC
REF
REF
DDC
DDM
<2 ms
MSC7115 Low-Cost 16-bit DSP with DDR Controller Data Sheet, Rev. 11
(1.25 V) supply fourth (last).
(1.25 V) supply first.
(1.2 V) supply third.
(1.2 V) supply second.
(3.3 V) supply fourth (last).
(2.5 V) supply second.
(3.3 V) supply first.
(2.5 V) supply third.
Figure 30. Voltage Sequencing Case 5
Time
DDIO
DDIO
and V
<2 ms
and V
DDM
Ramp-down
DDM
<10 ms
DDC
is less than 10 ms.
is less than 10 ms.
and V
DDM
is less than 2 ms for
Freescale Semiconductor
V
V
V
V
DDIO
DDM
REF
DDC
= 1.25 V
= 1.2 V
= 2.5 V
= 3.3 V