MSC7119VM1200 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MSC7119VM1200

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

Freescale Semiconductor 

Hardware Design Considerations

3.2.2.4 Case 4

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), 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:

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

2. 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.

Ramp-up

Ramp-down

VDDIO = 3.3 V

VDDM = 2.5 V

<10 ms

<10 ms

Time

Figure 33. Voltage Sequencing Case 4

VREF = 1.25 V

VDDC = 1.2 V

MSC7119 Data Sheet, Rev. 8

46

Freescale Semiconductor

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