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The TPS3808Gxx-Q1 device uses a precision reference to achieve 0.5% threshold accuracy for VIT ≤ 3.3 V. The reset delay time can be set to 20 ms by disconnecting the CT pin, 300 ms by connecting the CT pin to VDD using a resistor, or can be useradjusted from 1.25 ms to 10 s by connecting the CT pin to an external capacitor. The TPS3808Gxx-Q1 has a very low typical quiescent current of 2.4 μA, so it is well suited for battery-powered applications. 

Low Dropout Linear Regulator

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The TPS74801-Q1 low-dropout (LDO)  provides an easy-to-use robust power management  solution for a wide variety of applications. User programmable soft-start minimizes stress on the input power source by reducing capacitive inrush current on start-up. The soft-start is monotonic and well- suited for powering many different types of Monitoring or Provides a Sequencing Signal processors and ASICs. The enable input and power for Other Supplies good output allow easy sequencing with external regulators. This complete flexibility permits the user to configure a solution that meets the sequencing Voltage Startup requirements of FPGAs, DSPs, and other applications with special start-up requirements.

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IC	Description	Frequency	Used as
U14	MEMS Oscillator	33.3333 50 MHz	PS7 PS PLL clock
U5	MEMS Oscillator	25 MHz	Ethernet PHY Clock
U7	RTC (internal oscillator)	32.768 KHz	Used by RTC, CLKOUT of RTC not connected

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