MSC7116 Freescale Semiconductor / Motorola, MSC7116 Datasheet - Page 44

• Manufacturer Part Number: MSC7116
• Description: Low-Cost 16-bit DSP with DDR Controller and 10/100 Mbps Ethernet MAC
• Manufacturer: Freescale Semiconductor / Motorola

Hardware Design Considerations
3.2.2.2
The power-up sequence is as follows:
Note:
The power-down sequence is as follows:
Use the following guidelines:
44
1.
2.
3.
1.
2.
3.
4.
•
•
•
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 for V
Make sure that the time interval between the ramp-up or ramp-down for V
power-up and power-down.
Refer to Figure 31 for relative timing for Case 2.
Case 2
<10 ms
Ramp-up
DDIO
DDIO
DDC
REF
REF
DDM
DDC
(1.25 V) supply last (third).
(1.25 V) supply first.
(1.2 V) and V
(1.2 V) supply third.
(3.3 V) supply fourth (last).
(3.3 V) supply first.
(2.5 V) supply second.
Figure 31. Voltage Sequencing Case 2
DDM
(2.5 V) supplies simultaneously (second).
MSC7116 Data Sheet, Rev. 13
Time
DDIO
DDIO
and V
<10 ms
and V
DDC
Ramp-down
<10 ms
DDC
DDC
/V
DDM
is less than 10 ms.
and V
is less than 10 ms.
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