PIC32MX5XX_11 Datasheet, PDF (195/256 Pages) Microchip Technology – High-Performance, USB, CAN and Ethernet 32-bit Flash Microcontrollers

PIC32MX5XX/6XX/7XX
TABLE 31-17: 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
-40°C ≤TA ≤+105°C for V-Temp
Param.
No.
Symbol
Characteristics
Min.
Typical⁽¹⁾
Max.
Units Conditions
OS10 FOSC External CLKI Frequency
DC
—
50
MHz EC (Note 4)
(External clocks allowed only
4
—
50
MHz ECPLL (Note 3)
in EC and ECPLL modes)
OS11
Oscillator Crystal Frequency
3
—
10
MHz XT (Note 4)
OS12
4
—
10
MHz XTPLL
(Notes 3,4)
OS13
10
—
25
MHz HS (Note 5)
OS14
10
—
25
MHz HSPLL
(Notes 3,4)
OS15
OS20 TOSC
TOSC = 1/FOSC = TCY⁽²⁾
32
32.768
100
kHz SOSC (Note 4)
—
—
—
— See parameter
OS10 for FOSC
value
OS30 TOSL, External Clock In (OSC1)
TOSH High or Low Time
0.45 x TOSC
—
—
ns EC (Note 4)
OS31 TOSR, External Clock In (OSC1)
TOSF Rise or Fall Time
—
—
0.05 x TOSC ns EC (Note 4)
OS40 TOST Oscillator Start-up Timer Period
—
(Only applies to HS, HSPLL,
XT, XTPLL and SOSC Clock
Oscillator modes)
1024
—
TOSC (Note 4)
OS41 TFSCM Primary Clock Fail Safe
Time-out Period
—
2
—
ms (Note 4)
OS42 GM
External Oscillator
Transconductance
—
12
—
mA/V VDD = 3.3V,
TA = +25°C
(Note 4)
Note 1: Data in “Typical” column is at 3.3V, 25°C unless otherwise stated. Parameters are characterized but 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
external clock applied to the OSC1/CLKI pin.
3: PLL input requirements: 4 MHZ ≤ FPLLIN ≤ 5 MHZ (use PLL prescaler to reduce FOSC). This parameter is
characterized, but tested at 10 MHz only at manufacturing.
4: This parameter is characterized, but not tested in manufacturing.
© 2009-2011 Microchip Technology Inc.
DS61156G-page 195