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MSC7119 bảng dữ liệu(PDF) 43 Page - Freescale Semiconductor, Inc

tên linh kiện MSC7119
Giải thích chi tiết về linh kiện  Low-Cost 16-bit DSP with DDR Controller and 10/100 Mbps Ethernet MAC
PDF  60 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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MSC7119 bảng dữ liệu(HTML) 43 Page - Freescale Semiconductor, Inc

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Hardware Design Considerations
MSC7119 Data Sheet, Rev. 8
Freescale Semiconductor
43
3.2.2.1
Case 1
The power-up sequence is as follows:
1.
Turn on the VDDIO (3.3 V) supply first.
2.
Turn on the VDDC (1.2 V) supply second.
3.
Turn on the VDDM (2.5 V) supply third.
4.
Turn on the VREF (1.25 V) supply fourth (last).
The power-down sequence is as follows:
1.
Turn off the VREF (1.25 V) supply first.
2.
Turn off the VDDM (2.5 V) supply second.
3.
Turn off the VDDC (1.2 V) supply third.
4.
Turn of the VDDIO (3.3 V) supply fourth (last).
Use the following guidelines:
•
Make sure that the time interval between the ramp-down of VDDIO and VDDC is less than 10 ms.
•
Make sure that the time interval between the ramp-up or ramp-down for VDDC and VDDM is less than 10 ms for
power-up and power-down.
•
Refer to Figure 30 for relative timing for power sequencing case 1.
Figure 30. Voltage Sequencing Case 1
Time
Ramp-down
Ramp-up
VDDIO = 3.3 V
VDDM = 2.5 V
VDDC = 1.2 V
VREF = 1.25 V
<10 ms
<10 ms
<10 ms
<10 ms



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