ST92F120 datasheet(105/324 Pages) STMICROELECTRONICS

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ST92F120 - RESET AND CLOCK CONTROL UNIT (RCCU)

CERAMIC RESONATORS

Murata Electronics CERALOCK resonators have been tested with the ST92F120 at 3, 3.68, 4 and 5 MHz.

Some resonators have built-in capacitors (see Table 24).

The test circuit is shown in Figure .

Figure 52. Test Circuit

Table 24 shows the recommended conditions at different frequencies.

Table 24. Obtained Results

Advantages of using ceramic resonators:

CST and CSTCC types have built-in loading ca-

pacitors (those with values shown in parentheses

()).

Rp is always open in the previous table because

there is no need for a parallel resistor with a reso-

nator (it is needed only with a crystal).

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:

The above circuit condition is for design reference

only.

Recommended C1, C2 value depends on the cir-

cuit board used.

VDD

OSCIN

CERALOCK

ST92F120

OSCOUT

VSS

Freq.

(MHz)

Parts Number

C1 (PF)

C2 (PF)

Rp (Ohm)

Rd (Ohm)

CSA3.00MG

Open

CST3.00MGW

(30)

Open

3.68

CSA3.68MG

Open

CST3.68MGW

(30)

Open

CSTCC3.68MG

(15)

Open

CSA4.00MG

Open

CST4.00MGW

(30)

Open

CSTCC4.00MG

(15)

Open

CSA5.00MG

Open

CST5.00MGW

(30)

Open

CSTCC5.00MG

(15)

Open

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