ST7MC1K2-Auto datasheet(321/371 Pages) STMICROELECTRONICS

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Electrical characteristics

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12.5.2

External clock source

Figure 136. Typical application with an external clock source

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 resonator 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 stabilization time. Refer to the crystal/ceramic resonator

manufacturer for more details (frequency, package, accuracy...).

Table 198.

External clock source

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VOSC1H OSC1 input pin high level voltage

See Figure 136

0.7 x VDD

VDD

VOSC1L OSC1 input pin low level voltage

VSS

0.3 x VDD

tw(OSC1H)

tw(OSC1L)

OSC1 high or low time(1)

Data based on design simulation and/or technology characteristics, not tested in production.

tr(OSC1)

tf(OSC1)

OSC1 rise or fall time(1)

OSCx Input leakage current

VSS < VIN < VDD

± 1

µA

OSC1

OSC2

fOSC

External

clock source

VOSC1L

VOSC1H

tr(OSC1)

tf(OSC1)

tw(OSC1H)

tw(OSC1L)

90%

10%

VDD

ST7FMC1K2-Auto

ST7FMC1K6-Auto

ST7FMC2S4-Auto

ST7FMC2S6-Auto

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