AM3359 datasheet(112/236 Pages) TI

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AM335x

(ZCZ Package)

RTC_XTALIN

RTC_XTALOUT

N/C

LVCMOS

Digital

Clock

Source

VSS_RTC

VDDS_RTC

AM335x

(ZCE Package)

RTC_XTALIN

RTC_XTALOUT

N/C

LVCMOS

Digital

Clock

Source

VDDS_RTC

AM3359, AM3358, AM3357

AM3356, AM3354, AM3352

SPRS717F – OCTOBER 2011 – REVISED APRIL 2013

www.ti.com

4.2.2.4

OSC1 LVCMOS Digital Clock Source

Figure 4-14 shows the recommended oscillator connections when OSC1 of the ZCE package is connected

to an LVCMOS square-wave digital clock source and Figure 4-15 shows the recommended oscillator

connections when OSC1 of the ZCZ package is connected to an LVCMOS square-wave digital clock

source. The LVCMOS clock source is connected to the RTC_XTALIN terminal. In this mode of operation,

the RTC_XTALOUT terminal should not be used to source any external components. The printed circuit

board design should provide a mechanism to disconnect the RTC_XTALOUT terminal from any external

components or signal traces that may couple noise into OSC1 via the RTC_XTALOUT terminal.

The RTC_XTALIN terminal has a 10 - 40 k

Ω internal pull-up resistor which is enabled when OSC1 is

disabled. This internal resistor prevents the RTC_XTALIN terminal from floating to an invalid logic level

which may increase leakage current through the oscillator input buffer.

Figure 4-14. OSC1 (ZCE Package) LVCMOS Circuit Schematic

Figure 4-15. OSC1 (ZCZ Package) LVCMOS Circuit Schematic

Table 4-7. OSC1 LVCMOS Reference Clock Requirements

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

f(RTC_XTALIN)

Frequency, LVCMOS reference clock

32.768

MHz

Frequency, LVCMOS reference clock

Maximum RTC error =

-20

ppm

stability and tolerance(1)

10.512 minutes/year

Maximum RTC error = 26.28

-50

ppm

minutes/year

tdc(RTC_XTALIN)

Duty cycle, LVCMOS reference clock period

tjpp(RTC_XTALIN)

Jitter peak-to-peak, LVCMOS reference clock period

-1

tR(RTC_XTALIN)

Time, LVCMOS reference clock rise

tF(RTC_XTALIN)

Time, LVCMOS reference clock fall

(1)

Initial accuracy, temperature drift, and aging effects should be combined when evaluating a reference clock for this requirement.

112

Power and Clocking

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Product Folder Links: AM3359 AM3358 AM3357 AM3356 AM3354 AM3352

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