ST72F324K6B5 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72F324K6B5

8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE

STMicroelectronics 

ST72324

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 are based

on characterization results with specified typical

external components. In the application, the reso-

nator 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...).

Symbol

Parameter

Conditions

Min

Max

Unit

fOSC

Oscillator Frequency 1)

LP: Low power oscillator

MP: Medium power oscillator

MS: Medium speed oscillator

HS: High speed oscillator

1

2

>2

>4

4

8

MHz

>8

16

RF

Feedback resistor

CL1

CL2

Recommended load capacitance ver-

sus equivalent serial resistance of the

crystal or ceramic resonator (RS)

RS=200Ω

RS=200Ω

RS=200Ω

RS=100Ω

20

40

kΩ

LP oscillator 22

56

MP oscillator 22

MS oscillator 18

46

33

pF

HS oscillator 15

33

Symbol

Parameter

i2

OSC2 driving current

Conditions

Typ

Max

Unit

VDD=5V

VIN=VSS

LP oscillator 80

150

MP oscillator 160

250

MS oscillator 310

460

µA

HS oscillator 610

910

Figure 67. Typical Application with a Crystal or Ceramic Resonator

WHEN RESONATOR WITH

INTEGRATED CAPACITORS

CL1

OSC1

i2

fOSC

RESONATOR

RF

CL2

OSC2

ST72XXX

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.

125/161

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