OMAP3530ECUS72 datasheet(138/265 Pages) TI1

138 / 265 page

sys_32k

CK0

CK1

030-012

sys.xtalin

OCS0

OCS1

030-011

OMAP3530, OMAP3525

SPRS507H – FEBRUARY 2008 – REVISED OCTOBER 2013

www.ti.com

Figure 4-4. Crystal Oscillator in Bypass Mode

4.1.4

External 32-kHz CMOS Input Clock

A 32.768-kHz clock signal (often abbreviated to 32-kHz) can be supplied by an external 1.8-V CMOS

signal on pin sys_32k.

Table 4-6 summarizes the electrical constraints imposed to the clock source.

Table 4-6. 32-kHz Input Clock Source Electrical Characteristics

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Frequency

32.768

kHz

Input capacitance

0.44

Input resistance

0.25

106

Ω

Table 4-7 details the input requirements of the 32-kHz input clock.

Table 4-7. 32-kHz Input Clock Source Timing Requirements(1)

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

CK0

1 / tc(32k)

Frequency, sys_32k

32.768

kHz

CK3

tR(32k)

Rise time, sys_32k

CK4

tF(32k)

Fall time, sys_32k

CK5

tJ(32k)

Frequency stability, sys_32k

±200

ppm

(1)

See Table 3-4, Electrical Characteristics, Standard LVCMOS IOs part for sys_32k VIH/VIL parameters.

Figure 4-5. 32-kHz CMOS Clock

4.1.5

External sys_altclk CMOS Input Clock

A 48-, 54-, or up to 59- MHz clock signal can be supplied by an external 1.8-V CMOS signal on pin

sys_altclk.

Table 4-8 summarizes the electrical constraints imposed by the clock source.

Table 4-8. 48-, 54-, or up to 59- MHz Input Clock Source Electrical Characteristics

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Frequency , sys_altclk

48-, 54-, or up to 59- MHz

MHz

Input capacitance

0.74

Input resistance

0.25

106

Ω

138

CLOCK SPECIFICATIONS

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