AM3871 datasheet(173/345 Pages) TI1

173 / 345 page

POR

1.5 V (DVDD_DDR[x])

CVDD, CVDD_x

3.3 V Supplies

(DVDD, DVDD_x,

DVDD_C, VDDA_x_3P3)

1.8 V Supplies

(DVDD, DVDD_x, DVDD_M,

DVDD_DDR[x], VDDA_x_1P8, VDDA_1P8)

3.3 V Supplies

1.8 V Supplies

V Delta (A)

AM3874, AM3872, AM3871

www.ti.com

SPRS695

– SEPTEMBER 2011

Figure 7-1. Power-Up Sequence

V Delta Max = 2 V.

Figure 7-2. 3.3 V Supplies Rising Before 1.8 V Supplies Delta

7.2.8.2

Power-Down Sequence

For proper device operation, the following power-down sequence in Table 7-7 and Figure 7-3 must be

followed.

Table 7-7. Power-Down Sequence Ramping Values

NO.

DESCRIPTION

MIN

MAX

UNIT

CVDD, CVDD_x supplies to 1.8 V supplies

(1)

1.5 V (DVDD_DDR[x]) supplies to 1.8 V supplies

(1)

3.3 V supplies to 1.8 V supplies

(2)

(1)

The 1.8 V supplies must be

≥ 1.5 V (DVDD_DDR[x]) and CVDD, CVDD_x supplies.

(2)

The 3.3 V supplies must never be more than 2 V above the 1.8 V supplies (see Figure 7-2).

Power, Reset, Clocking, and Interrupts

173

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