PIC32MX440F256H-80I Datasheet, PDF (604/646 Pages) Microchip Technology – 64/100-Pin General Purpose and USB 32-Bit Flash Microcontrollers

PIC32MX3XX/4XX
FIGURE 30-2:
OSC1
EXTERNAL CLOCK TIMING
OS20
OS30
OS31
OS30
OS31
TABLE 30-17: EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 2.3V to 3.6V
(unless otherwise stated)
Operating temperature -40°C ≤ TA ≤ +85°C for Industrial
Param.
No.
Symbol
Characteristics
Min.
Typical⁽¹⁾
Max.
Units Conditions
OS10 FOSC External CLKI Frequency
DC
(External clocks allowed only
4
in EC and ECPLL modes)
—
50⁽³⁾
MHz EC
—
50⁽³⁾
MHz ECPLL⁽⁴⁾
OS11
OS12
Oscillator Crystal Frequency
3
4
—
10
MHz XT
—
10
MHz XTPLL⁽⁴⁾
OS13
OS14
10
—
25
MHz HS
10
—
25
MHz HSPLL⁽⁴⁾
OS15
OS20 TOSC
TOSC = 1/FOSC = TCY⁽²⁾
32
32.768
100
kHz SOSC
—
—
—
— See parameter
OS10 for FOSC
value
OS30 TOSL, External Clock In (OSC1)
TOSH High or Low Time
0.45 x TOSC
—
—
nsec EC
OS31 TOSR, External Clock In (OSC1)
TOSF Rise or Fall Time
—
—
0.05 x TOSC nsec EC
OS40 TOST Oscillator Start-up Timer Period
—
(Only applies to HS, HSPLL,
XT, XTPLL and SOSC Clock
Oscillator modes)
1024
—
TOSC -40°C to +85°C
OS41 TFSCM Primary Clock Fail Safe
Time-out Period
—
2
—
ms -40°C to +85°C
Note 1: Data in “Typical” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
2: Instruction cycle period (TCY) equals 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 exter-
nal clock applied to the OSC1/CLKI pin.
3: 40 MHz maximum for PIC32MX 40 MHz family variants.
4: PLL input requirements: 4 MHZ ≤ FPLLIN ≤ 5 MHZ (use PLL prescaler to reduce FOSC).
DS61143E-page 602
Preliminary
© 2008 Microchip Technology Inc.