Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO データシート

1433

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

C

LEXT

 = 2x(

C

CRYSTAL

 – 

C

L

 

– 

C

PCB

)

where:

 

C

PCB

 is the capacitance of the printed circuit board (PCB) track layout from the crystal to the SAM4 pin.

Note:

1. These characteristics apply only when the 3-20 MHz crystal oscillator is in Bypass mode.

XIN

XOUT

C

LEXT

C

L

C

LEXT

C

CRYSTAL

SAM4

R = 1k

Ω

 if Crystal Frequency

is lower than 8 MHz

ESR

Equivalent Series Resistor (R

S

)

Fundamental @ 3 MHz

Fundamental @ 8 MHz

Fundamental @ 12 MHz

Fundamental @ 16 MHz

Fundamental @ 20 MHz

—

—

—

—

—

—

—

—

—

—

200

100

80

80

50

Ω

C

M

Motional capacitance

—

—

—

8

fF

C

SHUNT

Shunt capacitance

—

—

—

7

pF

1/(t

CPXIN

)

XIN Clock Frequency

—

—

50

MHz

t

CPXIN

XIN Clock Period

20

—

—

ns

t

CHXIN

XIN Clock High Half-period

8

—

—

ns

t

CLXIN

XIN Clock Low Half-period

8

—

—

ns

t

CLCH

Rise Time

2.2

—

—

ns

t

CHCL

Fall Time

2.2

—

—

ns

V

XIN_IL

V

XIN 

Low-level Input Voltage

-0.3 —

MIN

[0.8V,0.3 x V

VDDIO

]

V

V

XIN_IH

V

XIN 

 High-level Input Voltage

MIN

[2.0V,0.7 x V

VDDIO

]

—

V

VDDIO

 +0.3V

V