ST92F124 datasheet(138/426 Pages) STMICROELECTRONICS

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ST92F124/F150/F250 - RESET AND CLOCK CONTROL UNIT (RCCU)

CERAMIC RESONATORS

Murata Electronics CERALOCK resonators have been tested with the ST92F150 at 3, 3.68, 4 and 5 MHz.

These recommended resonators have built-in capacitors (see Table 32).

The test circuit is shown in Figure 69.

Figure 69. Test Circuit

Table 32 shows the recommended conditions at different frequencies.

Table 32. Obtained Results

Advantages of using ceramic resonators:

CSTCR and CSTCC types have built-in loading

capacitors.

Smallest loading capacitor resonators are recom-

mended for standard applications.

Highest loading capacitor resonators are recom-

mended for automotive applications with CAN and

tight frequency tolerance.

Test conditions:

The evaluation conditions are 4.5 to 5.5 V for the

supply voltage and -40° to 105° C for the tempera-

ture range.

Caution:

These circuit conditions are for design reference

only.

Recommended C1, C2 value depends on the cir-

cuit board used.

For tight frequency tolerance applications, please

contact the nearest Murata office for more de-

tailled PCB evaluation regarding layout.

Note 1:

Attention must be paid to leakage currents around

the OSCIN pin. Leakage paths from VDD could al-

ter the DC polarization of the inverter stage and in-

troduce a mismatch with the second stage, and

possibly stop the clock signal. It is recommended

to surround the oscillator components by a ground

ring on the printed circuit board and if necessary to

apply a coating film to avoid humidity problems.

Note 2:

Attention must be paid to the capacitive loading of

OSCOUT. OSCOUT must not be used to drive ex-

ternal circuits.

VDD

OSCIN

CERALOCK

ST92F150

OSCOUT

VSS

Freq.

(MHz)

Parts Number

C1 (pF)

C2 (pF)

Rd (Ohm)

CSTCR5M00G55A-R0

CSTCC5M00G56A-R0

CSTCR4M00G55A-R0

CSTCC4M00G56A-R0

CSTCC3M00G56A-R0

3.68

CSTCC3M68G56A-R0

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