ST92185B datasheet(59/178 Pages) STMICROELECTRONICS

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ST92185B - RESET AND CLOCK CONTROL UNIT (RCCU)

OSCILLATOR CHARACTERISTICS (Cont’d)

The following table is relative to the fundamental

quartz crystal only; assuming:

– Rs: parasitic series resistance of the quartz crys-

tal (upper limit)

– C0: parasitic capacitance of the crystal (upper

limit,

≤ 7 pF)

– C1,C2: maximum total capacitance on pins OS-

CIN/OSCOUT (value including external capaci-

tance tied to the pin plus the parasitic

capacitance of the board and device).

Table 9. Crystal Specification (C0

≤ 7pF)

Legend:

Rs: Parasitic Series Resistance of the quartz crystal (up-

per limit) C0: Parasitic capacitance of the quartz crystal

(upper limit, < 7 pF)

CL1, CL2: Maximum Total Capacitance on pins OSCIN

and OSCOUT (the value includes the external capaci-

tance tied to the pin plus the parasitic capacitance of the

board and of the device)

gm: Transconductance of the oscillator

Note.The tables are relative to the fundamental quartz

crystal only (not ceramic resonator).

Freq.

MHz.

CL1=CL2=

39 pF

Rs Max

865

260

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