TDA2EX datasheet(142/391 Pages) TI1

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vssa_osc0

Device

xo_osc0

xi_osc0

SPRS906_CLK_04

142

TDA2EG-17

SPRS969B – AUGUST 2016 – REVISED JUNE 2017

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Specifications

Table 5-14. OSC0 Crystal Electrical Characteristics (continued)

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

tj(xiosc0)

Frequency accuracy(1), xi_osc0

Ethernet and MLB not used

±200

ppm

Ethernet RGMII and RMII

using derived clock

±50

Ethernet MII using derived

clock

±100

MLB using derived clock

±50

(1) Crystal characteristics should account for tolerance+stability+aging.

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

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

Table 5-15 details the switching characteristics of the oscillator and the requirements of the input clock.

Table 5-15. Oscillator Switching Characteristics—Crystal Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Oscillation frequency

19.2, 20, 27 MHz

MHz

tsX

Start-up time

5.9.4.1.2 OSC0 Input Clock

A 1.8-V LVCMOS-Compatible Clock Input can be used instead of the internal oscillator to provide the

SYS_CLKIN1 clock input to the system. The external connections to support this are shown in Figure 5-

10. The xi_osc0 pin is connected to the 1.8-V LVCMOS-Compatible clock source. The xi_osc0 pin is left

unconnected. The vssa_osc0 pin is connected to board ground (VSS).

Figure 5-10. 1.8-V LVCMOS-Compatible Clock Input

Table 5-16 summarizes the OSC0 input clock electrical characteristics.

Table 5-16. OSC0 Input Clock Electrical Characteristics—Bypass Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Frequency

19.2, 20, 27

MHz

CIN

Input capacitance

2.184

2.384

2.584

IIN

Input current (3.3V mode)

µA

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