ST72325 datasheet(150/196 Pages) STMICROELECTRONICS

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CLOCK AND TIMING CHARACTERISTICS (Cont’d)

12.5.3 Crystal and Ceramic Resonator Oscillators

The ST7 internal clock can be supplied with four

different Crystal/Ceramic resonator oscillators. All

the information given in this paragraph is based on

characterization results with specified typical ex-

ternal components. In the application, the resona-

tor and the load capacitors have to be placed as

close as possible to the oscillator pins in order to

minimize output distortion and start-up stabiliza-

tion time. Refer to the crystal/ceramic resonator

manufacturer for more details (frequency, pack-

age, accuracy...).

Notes:

1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value.

Refer to crystal/ceramic resonator manufacturer for more details.

2. Data based on characterisation results, not tested in production.

Symbol

Parameter

Conditions

Min

Max

Unit

fOSC

Oscillator Frequency 1)

116

MHz

Feedback resistor2)

Ω

CL1

CL2

Recommended load capacitance ver-

sus equivalent serial resistance of the

crystal or ceramic resonator (RS)

fOSC= 1 to 2 MHz

fOSC= 2 to 4 MHz

fOSC= 4 to 8 MHz

fOSC= 8 to 16 MHz

Symbol

Parameter

Conditions

Typ

Max

Unit

OSC2 driving current

VDD=5V:

fOSC= 2MHz, C0 = 6pF, Cl1 = Cl2 = 68pF

fOSC= 4MHz, C0 = 6pF, Cl1 = Cl2 = 68pF

fOSC= 8MHz, C0 = 6pF, Cl1 = Cl2 = 40pF

fOSC= 16MHz, C0 = 7pF, Cl1 = Cl2 = 20pF

426

425

456

660

µA

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