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

3.2.2.3 Case 3

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) and VREF (1.25 V) supplies simultaneously (third).

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 VDDM (2.5 V) and VREF (1.25 V) supplies simultaneously (first).

2. Turn off the VDDC (1.2 V) supply second.

3. Turn of the VDDIO (3.3 V) supply third (last).

Use the following guidelines:

• Make sure that the time interval between the ramp-down for VDDIO and VDDC is less than 10 ms.

• 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 32 for relative timing for Case 3.

Ramp-up

Ramp-down

VDDIO = 3.3 V

VDDM = 2.5 V

<10 ms

<10 ms

<10 ms

<10 ms

Time

Figure 32. Voltage Sequencing Case 3

VREF = 1.25 V

VDDC = 1.2 V

MSC7119 Data Sheet, Rev. 8

Freescale Semiconductor

45

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