ST90R158 datasheet(78/190 Pages) STMICROELECTRONICS

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ST90158 - RESET AND CLOCK CONTROL UNIT (RCCU)

OSCILLATOR CHARACTERISTICS (Cont’d)

CERAMIC RESONATORS

Murata Electronics CERALOCK resonators have been tested with the ST90158 at 3, 3.68, 4 and 5 MHz.

Some resonators have built-in capacitors (see Table 18).

The test circuit is shown in Figure 40.

Figure 40. Test circuit

Table 18 shows the recommended conditions at different frequencies.

Table 18. 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 2.7 to 5.5 V for the

supply voltage and -40

° to 85° 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

ST90158

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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