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70291E Datasheet, PDF (355/436 Pages) Microchip Technology – High-Performance, 16-bit Digital Signal Controllers
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dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04
FIGURE 31-2:
EXTERNAL CLOCK TIMING
Q1 Q2
Q3 Q4 Q1
Q2 Q3
Q4
OSC1
CLKO
OS41
OS20
OS25
OS30 OS30
OS31 OS31
OS40
TABLE 31-16: EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C ≤ TA ≤ +85°C for Industrial
-40°C ≤ TA ≤ +125°C for Extended
Param
No.
Symb
Characteristic
Min
Typ(1)
Max
Units Conditions
OS10 FIN External CLKI Frequency
DC
—
40
MHz EC
(External clocks allowed only
in EC and ECPLL modes)
Oscillator Crystal Frequency
3.5
—
10
MHz XT
10
—
40
MHz HS
—
33
kHz SOSC
OS20
OS25
TOSC TOSC = 1/FOSC
TCY Instruction Cycle Time(2)
12.5
—
DC
ns —
25
—
DC
ns —
OS30 TosL, External Clock in (OSC1)
TosH High or Low Time
0.375 x TOSC — 0.625 x TOSC ns EC
OS31
OS40
OS41
TosR,
TosF
TckR
TckF
External Clock in (OSC1)
Rise or Fall Time
CLKO Rise Time(3)
CLKO Fall Time(3)
—
—
20
ns EC
—
5.2
—
ns —
—
5.2
—
ns —
OS42 GM
External Oscillator
Transconductance(4)
14
16
18
mA/V VDD = 3.3V
TA = +25ºC
Note 1: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated.
2: Instruction cycle period (TCY) equals two times the input oscillator time-base period. All specified values
are based on characterization data for that particular oscillator type under standard operating conditions
with the device executing code. Exceeding these specified limits may result in an unstable oscillator
operation and/or higher than expected current consumption. All devices are tested to operate at “min.”
values with an external clock applied to the OSC1/CLKI pin. When an external clock input is used, the
“max.” cycle time limit is “DC” (no clock) for all devices.
3: Measurements are taken in EC mode. The CLKO signal is measured on the OSC2 pin.
4: Data for this parameter is Preliminary. This parameter is characterized, but not tested in manufacturing.
© 2011 Microchip Technology Inc.
DS70291E-page 355
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