ST92195D View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92195D

48-96 Kbyte ROM HCMOS MCU WITH ON-SCREEN DISPLAY AND TELETEXT DATA SLICER

STMicroelectronics 

ST92195C/D - RESET AND CLOCK CONTROL UNIT (RCCU)

Table 10. Oscillator Transconductance

gm

Min

Typ

Max

mA/V

0.77

1.5

2.4

Figure 29. Crystal Oscillator

CRYSTAL CLOCK

ST9

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).

OSCIN

OSCOUT

CL1

CL2

Table 11. Crystal Specification (C0 ≤ 7 pF)

Freq.

MHz.

CL1 = CL2 = 39 pF

Rs Max

8

65

4

260

Note: Depending on the application it may be better not to

implement CL1.

Figure 30. Internal Oscillator Schematic

HALT

Legend:

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

per limit) C0: Parasitic capacitance of the quartz crystal

(upper limit, < 7pF)

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).

R

RIN

ROUT

OSCIN

OSCOUT

Figure 31. External Clock

n

EXTERNAL CLOCK

OSCIN

CLOCK

INPUT

OSCOUT

NC

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