ST90135M5Q6 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST90135M5Q6' PDF : 190 Pages View PDF
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
VDD
ST90158
OSCIN
OSCOUT
VSS
Rp
CERALOCK Rd
V1
V2
C1 C2
Table 18 shows the recommended conditions at different frequencies.
Table 18. Obtained Results
Freq.
(MHz)
3
3.68
4
5
Parts Number
CSA3.00MG
CST3.00MGW
CSA3.68MG
CST3.68MGW
CSTCC3.68MG
CSA4.00MG
CST4.00MGW
CSTCC4.00MG
CSA5.00MG
CST5.00MGW
CSTCC5.00MG
C1 (PF)
30
(30)
30
(30)
(15)
30
(30)
(15)
30
(30)
(15)
C2 (PF)
30
(30)
30
(30)
(15)
30
(30)
(15)
30
(30)
(15)
Rp (Ohm)
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Rd (Ohm)
0
0
0
0
0
0
0
0
0
0
0
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.
78/190
9
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