AM6548ACD datasheet(158/284 Pages) TI

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VDDS_OSC1

OSC1_XO

Time

VSS

VDDS_OSC1 (min.)

VDD_CORE (min.)

VSS

VDD_CORE

Figure 7-21. OSC1 Start-up Time

7.9.4.1.4 Auxiliary OSC1 LVCMOS Digital Clock Source

Figure 7-22 shows the recommended oscillator connections when OSC1 is connected to an LVCMOS square-

wave digital clock source The 1.8-V LVCMOS-Compatible clock source is connected to the OSC1_XI pin. In

this mode of operation, the OSC1_XO pin is left unconnected and should not be used to source any external

components.

VSS

Device

OSC1_XO

OSC1_XI

SPRSP08_CLK_01

PCB Ground

Figure 7-22. 1.8-V LVCMOS-Compatible Clock Input

Table 7-20 summarizes the OSC1 input clock electrical characteristics.

Table 7-20. OSC1 Switching Characteristics – Crystal Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Frequency

19.2, 20, 24, 25, 26, 27

MHz

CIN

Input capacitance

2.184

2.384

2.584

IIN

Input current (3.3V mode)

µA

Table 7-21 details the OSC1 input clock timing requirements.

Table 7-21. OSC1 Input Clock Timing Requirements

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

CK0

1 / tc(OSC1_XI)

Frequency, OSC1_XI

19.2, 20, 24, 25, 26, 27

MHz

AM6548, AM6528, AM6546, AM6526

SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021

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