AM5728 datasheet(200/415 Pages) TI1

200 / 415 page

vssa_osc0

Device

xo_osc0

xi_osc0

SPRS85v_CLK_09

200

AM5729, AM5728, AM5726

SPRS953F – DECEMBER 2015 – REVISED MAY 2019

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Product Folder Links: AM5729 AM5728 AM5726

Clock Specifications

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

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Crystal shunt capacitance

ESR = 30 Ω

ESR = 40 Ω

19.2 MHz, 20 MHz, 27 MHz

ESR = 50 Ω

19.2 MHz, 20 MHz

27 MHz

ESR = 60 Ω

19.2 MHz, 20 MHz

27 MHz

Not Supported

ESR = 80 Ω

19.2 MHz, 20 MHz

27 MHz

Not Supported

ESR = 100 Ω

19.2 MHz, 20 MHz

27 MHz

Not Supported

Crystal motional inductance for fp = 20 MHz

10.16

Crystal motional capacitance

3.42

tj(xiosc0)

Frequency accuracy (1), xi_osc0

Ethernet not used

±200

ppm

Ethernet RGMII and RMII

using derived clock

±50

Ethernet MII using derived

clock

±100

(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_CLK1 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.

AM5728 Datasheet(PDF) 200 Page - Texas Instruments

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