LQFP100 datasheet(73/116 Pages) STMICROELECTRONICS

73 / 116 page

DocID14619 Rev 13

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SPC560B40x/50x, SPC560C40x/50x

Package pinouts and signal descriptions

115

Figure 13. Crystal oscillator and resonator connection scheme

XTAL

EXTAL

XTAL

EXTAL

DEVICE

XTAL

EXTAL

VDD

2. A series resistor may be required, according to crystal oscillator supplier recommendations.

1. XTAL/EXTAL must not be directly used to drive external circuits

Notes:

Table 37. Crystal description

Nominal

frequency

(MHz)

NDK crystal

reference

Crystal

equivalent

series

resistance

ESR



Crystal

motional

capacitance

(Cm) fF

Crystal

motional

inductance

(Lm) mH

Load on

xtalin/xtalout

C1 = C2

(pF)(1)

Shunt

capacitance

between

xtalout

and xtalin

C0(2) (pF)

NX8045GB

300

2.68

591.0

2.93

NX5032GA

300

2.46

160.7

3.01

150

2.93

86.6

2.91

120

3.11

56.5

2.93

120

3.90

25.3

3.00

The values specified for C1 and C2 are the same as used in simulations. It should be ensured that the testing includes all

the parasitics (from the board, probe, crystal, etc.) as the AC / transient behavior depends upon them.

The value of C0 specified here includes 2 pF additional capacitance for parasitics (to be seen with bond-pads, package,

etc.).

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