Datasheet

PIC24FJ128GC010 FAMILY
DS30009312B-page 438  2012-2013 Microchip Technology Inc.
FIGURE 37-3: EXTERNAL CLOCK TIMING
OSCI
CLKO
Q4 Q1 Q2 Q3 Q4 Q1
OS20
OS25
OS30 OS30
OS40
OS41
OS31OS31
Q1 Q2 Q3 Q4 Q2 Q3
TABLE 37-22: EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
Param
No.
Symbol Characteristic Min Typ
(1)
Max Units Conditions
OS10 F
OSC External CLKI Frequency
(External clocks allowed
only in EC mode)
DC
1.97
—
—
32
48
MHz
MHz
EC
ECPLL (Note 2)
Oscillator Frequency 3.5
4
10
12
31
—
—
—
—
—
10
8
32
32
33
MHz
MHz
MHz
MHz
kHz
XT
XTPLL
HS
HSPLL
SOSC
OS20 TOSC TOSC = 1/FOSC — — — — See Parameter OS10 for
F
OSC value
OS25 T
CY Instruction Cycle Time
(3)
62.5 — DC ns
OS30 TosL,
TosH
External Clock in (OSCI)
High or Low Time
0.45 x TOSC ——nsEC
OS31 TosR,
TosF
External Clock in (OSCI)
Rise or Fall Time
— — 20 ns EC
OS40 TckR CLKO Rise Time
(4)
— 6 10 ns
OS41 TckF CLKO Fall Time
(4)
— 6 10 ns
Note 1: Data in the “Typ” column is at 3.3V, +25°C unless otherwise stated.
2: Represents input to the system clock prescaler. PLL dividers and postscalers must still be configured so
that the system clock frequency does not exceed the maximum frequency shown in Figure 37-1.
3: Instruction cycle period (T
CY) 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 OSCI/CLKI pin. When an external clock input is used, the “Max.” cycle time
limit is “DC” (no clock) for all devices.
4: Measurements are taken in EC mode. The CLKO signal is measured on the OSCO pin. CLKO is low for the
Q1-Q2 period (1/2 T
CY) and high for the Q3-Q4 period (1/2 TCY).