MSC7115 Motorola Semiconductor Products, MSC7115 Datasheet - Page 40

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

Hardware Design Considerations
3.2.2.1
The power-up sequence is as follows:
The power-down sequence is as follows:
Use the following guidelines:
40
1.
2.
3.
4.
1.
2.
3.
4.
•
•
•
Turn on the V
Turn on the V
Turn on the V
Turn on the 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 26 for relative timing for power sequencing case 1.
Case 1
<10 ms
Ramp-up
DDIO
DDIO
DDC
DDM
REF
REF
DDM
DDC
<10 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 second.
(1.2 V) supply third.
(3.3 V) supply fourth (last).
(2.5 V) supply third.
(3.3 V) supply first.
(2.5 V) supply second.
Figure 26. Voltage Sequencing Case 1
Time
DDIO
<10 ms
and V
Ramp-down
DDC
<10 ms
DDC
is less than 10 ms.
and V
DDM
is less than 10 ms for
Freescale Semiconductor
V
V
V
V
DDIO
DDM
REF
DDC
= 1.25 V
= 1.2 V
= 2.5 V
= 3.3 V