DRA821U2...ALM datasheet(134/252 Pages) TI

134 / 252 page

Device

WKUP_OSC0_XO

WKUP_OSC0_XI

Crystal

J7ES_WKUP_OSC_INT_02

PCB Ground

Figure 7-24. WKUP_OSC0 Crystal Implementation

The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-20 summarizes the

required electrical constraints.

Table 7-20. WKUP_OSC0 Crystal Circuit Requirements

PARAMETER

MIN

TYP

MAX UNIT

Fxtal

Crystal Parallel Resonance Frequency

19.2, 20, 24, 25, 26, 27

MHz

Fxtal

Crystal Frequency Stability and Tolerance

Ethernet RGMII and RMII

not used

±100

ppm

Ethernet RGMII and RMII

using derived clock

±50

CL1+PCBXI

Capacitance of CL1 + CPCBXI

CL2+PCBXO

Capacitance of CL2 + CPCBXO

Crystal Load Capacitance

Cshunt

Crystal Circuit Shunt Capacitance

ESRxtal = 30 Ω

19.2 MHz, 20 MHz,

24 MHz, 25 MHz, 26 MHz,

27 MHz

ESRxtal = 40 Ω

19.2 MHz, 20 MHz,

24 MHz, 25 MHz, 26 MHz,

27 MHz

ESRxtal = 50 Ω

19.2 MHz, 20 MHz,

24 MHz, 25 MHz, 26 MHz,

27 MHz

ESRxtal = 60 Ω

19.2 MHz, 20 MHz, 24 MHz

ESRxtal = 80 Ω

19.2 MHz, 20 MHz

25 MHz

ESRxtal = 100 Ω 19.2 MHz, 20 MHz

ESRxtal

Crystal Effective Series Resistance

100

When selecting a crystal, the system design must consider temperature and aging characteristics of the crystal

based on worst case environment and expected life expectancy of the system.

Table 7-21 details the switching characteristics of the oscillator.

DRA821U-Q1

SPRSP57D – APRIL 2020 – REVISED DECEMBER 2022

www.ti.com

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