dsPIC30F3014/4013
DS70138G-page 182
2010 Microchip Technology Inc.
TABLE 23-14: EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 2.5V to 5.5V
(unless otherwise stated)
Operating temperature
-40°C
TA +85°C for Industrial
-40°C
TA +125°C for Extended
Param
No.
Symbol
Characteristic
Min
Typ(1)
Max
Units
Conditions
OS10
FOSC
External CLKI Frequency
(external clocks allowed
only in EC mode)(2)
DC
4
40
10
7.5(3)
MHz
EC
EC with 4x PLL
EC with 8x PLL
EC with 16x PLL
Oscillator Frequency(2)
DC
0.4
4
10
12(4)
32.768
4
10
7.5(3)
25
20(4)
15(3)
25
22.5(3)
MHz
kHz
RC
XTL
XT
XT with 4x PLL
XT with 8x PLL
XT with 16x PLL
HS
HS/2 with 4x PLL
HS/2 with 8x PLL
HS/2 with 16x PLL
HS/3 with 4x PLL
HS/3 with 8x PLL
HS/3 with 16x PLL
LP
OS20
TOSC
TOSC = 1/FOSC
See parameter OS10
for FOSC value
OS25
TCY
Instruction Cycle Time(2,5)
33
DC
ns
OS30
TosL,
TosH
External Clock in (OSC1)
High or Low Time(2)
.45 x TOSC
——
ns
EC
OS31
TosR,
TosF
External Clock in (OSC1)
Rise or Fall Time(2)
——
20
ns
EC
OS40
TckR
CLKO Rise Time(2,6)
ns
See parameter DO31
OS41
TckF
CLKO Fall Time(2,6)
ns
See parameter DO32
Note 1:
Data in “Typ” column is at 5V, 25°C unless otherwise stated. Parameters are for design guidance only and
are not tested.
2:
These parameters are characterized but not tested in manufacturing.
3:
Limited by the PLL output frequency range.
4:
Limited by the PLL input frequency range.
5:
Instruction cycle period (TCY) equals four 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.
6:
Measurements are taken in EC or ERC modes. The CLKO signal is measured on the OSC2 pin. CLKO is
low for the Q1-Q2 period (1/2 TCY) and high for the Q3-Q4 period (1/2 TCY).
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