MSC7116 Freescale Semiconductor / Motorola, MSC7116 Datasheet - Page 47

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

3.2.2.5
The power-up sequence is as follows:
Note:
The power-down sequence is as follows:
Use the following guidelines:
Note:
Freescale Semiconductor
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 34 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
(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 34. Voltage Sequencing Case 5
MSC7116 Data Sheet, Rev. 13
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
Hardware Design Considerations
DDM
is less than 2 ms for
V
V
V
V
DDIO
DDM
REF
DDC
= 1.25 V
= 1.2 V
= 2.5 V
= 3.3 V
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