AM5728 datasheet(200/415 Pages) TI

200 / 415 page

vssa_osc0

Device

xo_osc0

xi_osc0

SPRS85v_CLK_09

AM5728, AM5726

SPRS915O – MARCH 2014 – REVISED OCTOBER 2015

www.ti.com

Table 6-1. OSC0 Crystal Electrical Characteristics (continued)

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

ESR = 30

19.2 MHz, 20 MHz, 27 MHz

ESR = 40

19.2 MHz, 20 MHz

ESR = 50

27 MHz

19.2 MHz, 20 MHz

ESR = 60

Crystal shunt capacitance

27 MHz

Not Supported

19.2 MHz, 20 MHz

ESR = 80

27 MHz

Not Supported

19.2 MHz, 20 MHz

ESR = 100

27 MHz

Not Supported

Crystal motional inductance for fp = 20 MHz

10.16

Crystal motional capacitance

3.42

Ethernet not used

±200

Ethernet RGMII and RMII

±50

tj(xiosc0)

Frequency accuracy (1), xi_osc0

using derived clock

ppm

Ethernet MII using derived

±100

clock

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

When selecting a crystal, the system design must take into account the temperature and aging

characteristics of a crystal versus the user environment and expected lifetime of the system.

Table 6-2 details the switching characteristics of the oscillator and the requirements of the input clock.

Table 6-2. Oscillator Switching Characteristics—Crystal Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Oscillation frequency

19.2, 20, 27

MHz

tsX

Start-up time

6.1.2.2

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 6-4.

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 6-4. 1.8-V LVCMOS-Compatible Clock Input

Table 6-3 summarizes the OSC0 input clock electrical characteristics.

200

Clock Specifications

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