PCIMX536AVV8C datasheet(22/178 Pages) FREESCALE

22 / 178 page

i.MX53xA Automotive and Infotainment Applications Processors, Rev. 2

Freescale Semiconductor

Electrical Characteristics

4.1.4

External Clock Sources

The i.MX53xA device has four external input system clocks, a low frequency (CKIL), a high frequency

(XTAL), and two general purpose CKIH1 and CKIH2 clocks.

The CKIL is used for low-frequency functions. It supplies the clock for wake-up circuit, power-down real

time clock operation, and slow system and watch-dog counters. The clock input can be connected to either

external oscillator or a crystal using internal oscillator amplifier.

The system clock input XTAL is used to generate the main system clock. It supplies the PLLs and other

peripherals. The system clock input can be connected to either external oscillator or a crystal using internal

oscillator amplifier.

CKIH1 and CKIH2 provide additional clock source option for peripherals that require specific and

accurate frequencies.

Table 7 shows the interface frequency requirements. Refer to Chapter 1 of the i.MX53 System

Development User's Guide for additional clock and oscillator information. Document number is

MX53UG.

4.1.5

Maximal Supply Currents

Table 8 represents the maximal momentary current transients on power lines, and should be used for power

supply selection. Maximal currents higher by far than the average power consumption of typical use cases.

For typical power consumption information, refer to i.MX53xA power consumption application note.

11 Lifetime of 43,800 hours based on 105 C junction temperature at nominal supply voltages.

Table 7. External Input Clock Frequency

Parameter Description

Symbol

Min

Typ

Max

Unit

CKIL Oscillator1

1 External oscillator or a crystal with internal oscillator amplifier.

fckil

—

32.7682/32.0

2 Recommended nominal frequency 32.768 kHz.

—kHz

CKIH1, CKIH2 Operating

Frequency

fckih1,

fckih2

See Table 32, "CAMP Electrical Parameters (CKIH1,

CKIH2)," on page 46

MHz

XTAL Oscillator

fxtal

MHz

Table 8. Maximal Supply Currents

Power Line

Conditions

Max Current

Unit

VDDGP

800 MHz ARM clock.

1450

VCC

800

VDDA+VDDAL1

100

VDD_DIG_PLL

VDD_ANA_PLL

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