ST7LITE49K2 datasheet(209/245 Pages) STMICROELECTRONICS

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ST7LITE49K2

Electrical characteristics

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13.6.2

Crystal and ceramic resonator oscillators

The ST7 internal clock can be supplied with ten 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 86.

Crystal/ceramic resonator oscillator characteristics

Symbol

Parameter

Conditions

Min Typ Max Unit

fCrOSC

Crystal oscillator frequency

MHz

CL1

CL2

Recommended load capacitance

versus equivalent serial

resistance of the crystal or

ceramic resonator (RS)

see table below

IDD(crOSC) Crystal oscillator supply current

(1)

Data based on a differential IDD measurement in run mode (fCPU = 8 MHz) between external clock source

configuration and external crystal resonator clock source configuration.

External crystal oscillator

frequency = 16 MHz,

VDD = 5 V

600

µA

Table 87.

Typical ceramic resonators(1)

Supplier

fCrOSC

(MHz)

Typical ceramic resonators

Supply

voltage

range

(V)

Temperature

range

(°C)

Reference

Type

Oscillator

modes

(pF)

(Ohm)

CSTCC2M00G56Z-R0

SMD

LP or MP

(47) (47) open

2.4 to

5.5

-40 to 85

CSTCR4M00G55Z-R0

SMD

MP or MS (39) (39) open

CSTLS4M00G56Z-B0

LEAD MP or MS (47) (47) open

CSTCE8M00G52Z-R0

SMD

MS or HS (10) (10) open

CSTLS8M00G53Z-B0

LEAD MS or HS (15) (15) open

CSTCE16M0V51Z-R0

SMD

(5)

open

3.3 to

5.5

CSALS16M0X55Z-B0

LEAD

open

( ) means load capacitor built in resonator.

Resonator characteristics given by the ceramic resonator manufacturer.

SMD = [-R0: plastic tape package Ø = 180 mm), -B0: Bulk]

LEAD = [-B0: bulk]

For more information on these resonators, please consult www.murata.com

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