PIC24FJ64GA705 Datasheet, PDF (369/412 Pages) –

PIC24FJ256GA705 FAMILY
FIGURE 32-3:
EXTERNAL CLOCK TIMING
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
OSCI
CLKO
OS20
OS25
OS40
OS30 OS30
OS31 OS31
OS41
TABLE 32-18: 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 FOSC External CLKI Frequency
DC
(External clocks allowed
4
only in EC mode)
—
32
MHz EC
—
48
MHz ECPLL (Note 2)
Oscillator Frequency
3.5
—
10
MHz XT
4
—
8
MHz XTPLL
10
—
32
MHz HS
12
—
24
MHz HSPLL
31
—
33
kHz SOSC
OS20 TOSC TOSC = 1/FOSC
—
—
—
— See Parameter OS10 for
FOSC value
OS25 TCY
Instruction Cycle Time⁽³⁾
62.5
—
DC
ns
OS30 TosL, External Clock in (OSCI) 0.45 x TOSC —
—
ns EC
TosH High or Low Time
OS31 TosR, External Clock in (OSCI)
—
TosF Rise or Fall Time
—
20
ns EC
OS40 TckR CLKO Rise Time⁽⁴⁾
—
15
30
ns
OS41 TckF CLKO Fall Time⁽⁴⁾
—
15
30
ns
Note 1: Data in the “Typ” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design guidance
only and are not tested.
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 32-1.
3: 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 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 TCY) and high for the Q3-Q4 period (1/2 TCY).
 2016 Microchip Technology Inc.
DS30010118B-page 369