SPC56EL54X datasheet(117/165 Pages) STMICROELECTRONICS

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SPC56ELx, SPC564Lx

Electrical characteristics

164

Figure 8. Main oscillator electrical characteristics

VXOSCHSOP

TXOSCHSSU

VXTAL

VXOSCHS

valid internal clock

90%

10%

1/fXOSCHS

MTRANS

Table 24. Main oscillator electrical characteristics

Symbol

Parameter

Conditions(1)

Value

Unit

Min

Typ

Max

fXOSCHS

Oscillator frequency

—

4.0

—

40.0

MHz

gmXOSCHS

Oscillator

transconductance

VDD = 3.3 V ±10%

4.5

—

13.25

mA/V

VXOSCHS

D Oscillation amplitude

fOSC = 4, 8, 10, 12,

16 MHz

1.3

—

fOSC = 40 MHz

1.1

—

VXOSCHSOP D

Oscillation operating

point

—

0.82

—

TXOSCHSSU T Oscillator start-up time

fOSC = 4, 8, 10, 12 MHz(2)

——

fOSC = 16, 40 MHz(2)

——

VIH

Input high level CMOS



Schmitt Trigger

Oscillator bypass mode

0.65 × VDD

—VDD + 0.4

VIL

Input low level CMOS



Schmitt Trigger

Oscillator bypass mode

–0.4

—

0.35 × VDD

1. VDD = 3.3 V ±10%, TJ = –40 to +150 °C, unless otherwise specified.

2. The recommended configuration for maximizing the oscillator margin are:



XOSC_MARGIN = 0 for 4 MHz quartz



XOSC_MARGIN = 1 for 8/16/40 MHz quartz

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