SPC572L64F2 datasheet(41/112 Pages) STMICROELECTRONICS

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SPC572Lx

Electrical characteristics

111

1. PLL0IN clock retrieved directly from either Internal RC Oscillator (IRCOSC) or External Oscillator (XOSC) clock. Input

characteristics are granted when using XOSC.

2. fPLL0IN frequency must be scaled down using PLLDIG_PLL0DV[PREDIV] to ensure PFD input signal is in the range of

8MHz-20MHz.

VDD_LV noise due to application in the range VDD_LV = 1.25 V ± 5% with frequency below PLL bandwidth (40 kHz) is

filtered.

Table 21. External oscillator electrical specifications

Symbol

Parameter

Conditions

Value

Unit

Min

Max

fXTAL

CC D Crystal frequency range(1)

—

MHz

> 8

> 20

tcst

CC T Crystal start-up time(2)(3)

——

trec

CC T Crystal recovery time(4)

——

0.5

VIHEXT CC D EXTAL input high voltage

(External Reference)

VREF = 0.28 * VDD_HV_IO_JTAG

VREF + 0.6

—

VILEXT CC D EXTAL input low voltage(5)

VREF = 0.28 * VDD_HV_IO_JTAG

—VREF - 0.6

CS_EXTAL CC T Total on-chip stray

capacitance on EXTAL pin

—

2.5 + value

from

Table 22

CS_XTAL CC T Total on-chip stray

capacitance on XTAL pin

—

2.5 + value

from

Table 22

CC D Oscillator Transconductance

TJ =-40 °C to

150 °C

4.5 V <

VDD_HV_IO <

5.5 V

fXTAL ≤ 8MHz

2.6

11.0

mA/V

DfXTAL ≤ 20 MHz

7.9

26.0

DfXTAL ≤ 40 MHz

10.4

34.0

IXTAL

CC D XTAL current(6)

TJ = 150 °C

—

VHYS

CC D Comparator Hysteresis

TJ = 150 °C

0.1

1.0

1. The range is selectable by DCF record.

2. This value is determined by the crystal manufacturer and board design.

3. Proper PC board layout procedures must be followed to achieve specifications.

4. Crystal recovery time is the time for the oscillator to settle to the correct frequency after adjustment of the integrated load

capacitor value.

5. Applies to an external clock input and not to crystal mode.

6. IXTAL is the oscillator bias current out of the XTAL pin with both EXTAL and XTAL pins grounded. Test circuit is shown in

Figure 11.

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