Datasheet

MSP430F47x
MIXED SIGNAL MICROCONTROLLER
SLAS629A -- MARCH 2009 -- REVISED APRIL 2009
38
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature (unless otherwise
noted)
crystal oscillator, LFXT1, high frequency modes
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
f
LFXT1
LFXT1 oscillator crystal frequency Ceramic resonator 1.8 V to 3.6 V 0.45 8 MHz
f
LFXT1
LFXT1 oscillator crystal frequency Crystal resonator 1.8 V to 3.6 V 1 8 MHz
C
L,eff
Integrated effective load
capacitance, HF mode
(see Note 1)
SeeNote2 1 pF
Duty cycle Measured at P1.5/ACLK, 2.2 V/3 V 40 50 60 %
NOTES: 1. Includes parasitic bond and package capacitance (approximately 2 pF per pin).
Since the PCB adds additional capacitance it is recommended to verify the correct load by measuring the ACLK frequency. For a
correct setup the effective load capacitance should always match the specification of the used crystal.
2. Requires external capacitors at both terminals. Values are specified by crystal manufacturers.
crystal oscillator, XT2, high frequency modes
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
f
XT2
XT2 oscillator crystal frequency Ceramic resonator 1.8 V to 3.6 V 0.45 8 MHz
f
XT2
XT2 oscillator crystal frequency Crystal resonator 1.8 V to 3.6 V 1 8 MHz
C
L,eff
Integrated effective load
capacitance, HF mode
(see Note 1)
(see Note 2) 1 pF
Duty cycle Measured at P1.4/SMCLK 2.2 V/3 V 40 50 60 %
NOTES: 1. Includes parasitic bond and package capacitance (approximately 2 pF per pin).
Since the PCB adds additional capacitance it is recommended to verify the correct load by measuring the ACLK frequency. For a
correct setup the effective load capacitance should always match the specification of the used crystal.
2. Requires external capacitors at both terminals. Values are specified by crystal manufacturers.