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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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AM1808 Fiches technique(PDF) 70 Page - Texas Instruments |
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AM1808 Fiches technique(HTML) 70 Page - Texas Instruments |
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70 / 265 page  AM1808 SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014 www.ti.com 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. 2. Core logic supplies: (a) All variable 1.2V - 1.0V core logic supplies (CVDD) (b) All static core logic supplies (RVDD, PLL0_VDDA, PLL1_VDDA, 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). 70 Peripheral Information and Electrical Specifications Copyright © 2010–2014, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: AM1808 |
Numéro de pièce similaire - AM1808_14 |
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Description similaire - AM1808_14 |
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