AM1808AZCED3 datasheet(70/264 Pages) TI

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AM1808

SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010

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6.2

Recommended Clock and Control Signal Transition Behavior

All clocks and control signals must transition between VIH and VIL (or between VIL and VIH) in a monotonic

manner.

6.3

Power Supplies

6.3.1

Power-on Sequence

The device should be powered-on in the following order:

•

1) RTC (RTC_CVDD) may be powered from an external device (such as a battery) prior to all other

supplies being applied or powered-up at the same time as CVDD. If the RTC is not used, RTC_CVDD

should be connected to CVDD. RTC_CVDD should not be left unpowered while CVDD is powered.

•

2a) All variable 1.2V - 1.0V core logic supplies (CVDD)

•

2b) All static 1.2V logic supplies (RVDD, VDDA_12_PLL0, VDDA_12_PLL1, USB_CVDD ,

SATA_VDD). If voltage scaling is not used on the device, groups 2a) and 2b) can be controlled from

the same power supply and powered up together.

•

3) All static 1.8V IO supplies (DVDD18, DDR_DVDD18, USB0_VDDA18 , USB1_VDDA18 and

SATA_VDDR) and any of the LVCMOS IO supply groups used at 1.8V nominal (DVDD3318_A,

DVDD3318_B, or DVDD3318_C).

•

4) All analog 3.3V PHY supplies (USB0_VDDA33 and USB1_VDDA33; these are not required if both

USB0 and USB1 are not used) and any of the LVCMOS IO supply groups used at 3.3V nominal

(DVDD3318_A, DVDD3318_B, or DVDD3318_C).

There is no specific required voltage ramp rate for any of the supplies as long as the LVCMOS supplies

operated at 3.3V (DVDD3318_A, DVDD3318_B, or DVDD3318_C) never exceed the STATIC 1.8V

supplies by more than 2 volts.

RESET must be maintained active until all power supplies have reached their nominal values.

6.3.2

Power-off Sequence

The power supplies can be powered-off in any order as long as LVCMOS supplies operated at 3.3V

(DVDD3318_A, DVDD3318_B, or DVDD3318_C) never exceed static 1.8V supplies by more than 2 volts.

There is no specific required voltage ramp down rate for any of the supplies (except as required to meet

the above mentioned voltage condition).

Peripheral Information and Electrical Specifications

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