IMX53IEC datasheet(20/173 Pages) FREESCALE

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i.MX53 Applications Processors for Industrial Products, Rev. 6

Freescale Semiconductor

Electrical Characteristics

4.1.4

External Clock Sources

The i.MX53 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. See Chapter 1 of i.MX53 System Development

User's Guide (MX53UG) for additional clock and oscillator information.

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, see i.MX53 power consumption application note.

11 The analog supplies should be isolated in the application design. Use of series inductors is recommended.

12 VDD_REG is power supply input for the integrated linear regulators of VDD_ANA_PLL and VDD_DIG_PLL when they are

configured to the internal supply option. VDDR_REG still has to be tied to 2.5 V supply when VDD_ANA_PLL and

VDD_DIG_PLL are configured for external power supply mode although in this case it is not used as supply source.

13 Lifetime of 87,600 hours based on 105 oC 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 44

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

IMX53IEC Datasheet(PDF) 20 Page - Freescale Semiconductor, Inc

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