MSC7119 datasheet(46/60 Pages) FREESCALE

부품명	MSC7119

상세설명	Low-Cost 16-bit DSP with DDR Controller and 10/100 Mbps Ethernet MAC

PDF	60 Pages

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제조업체	FREESCALE [Freescale Semiconductor, Inc]

홈페이지	http://www.freescale.com

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46 / 60 page

MSC7119 Data Sheet, Rev. 8

Hardware Design Considerations

Freescale Semiconductor

3.2.2.4

Case 4

The power-up sequence is as follows:

Turn on the VDDIO (3.3 V) supply first.

Turn on the VDDC (1.2 V), VDDM (2.5 V), and VREF (1.25 V) supplies simultaneously (second).

Note:

Make sure that the time interval between the ramp-up of VDDIO and VDDC is less than 10 ms.

The power-down sequence is as follows:

Turn off the VDDC (1.2 V), VREF (1.25 V), and VDDM (2.5 V) supplies simultaneously (first).

Turn of the VDDIO (3.3 V) supply last.

Use the following guidelines:

•

Make sure that the time interval between the ramp-up or ramp-down time for VDDC and VDDM is less than 10 ms for

power-up and power-down.

•

Refer to Figure 33 for relative timing for Case 4.

Figure 33. Voltage Sequencing Case 4

Time

Ramp-down

Ramp-up

VDDIO = 3.3 V

VDDM = 2.5 V

VDDC = 1.2 V

VREF = 1.25 V

<10 ms

MSC7119 데이터시트(PDF) 46 Page - Freescale Semiconductor, Inc