Datasheet

 2012-2013 Microchip Technology Inc. DS60001185C-page 285
PIC32MX330/350/370/430/450/470
TABLE 30-17: EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 2.3V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  T
A  +85°C for Industrial 
-40°C  T
A  +105°C for V-temp
Param.
No.
Symbol Characteristics Min. Typical
(1)
Max. Units Conditions
OS10 F
OSC External CLKI Frequency
(External clocks allowed only
in EC and ECPLL modes)
DC
DC
4
4
—
—
—
—
100
80
100
80
MHz
MHz
MHz
MHz
EC (Note 4)
EC (Notes 4,5)
ECPLL
(Note 3)
ECPLL
(Notes 3,5)
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 32 32.768 100 kHz S
OSC (Note 4)
OS20 TOSC TOSC = 1/FOSC = TCY (Note 2) — — — — See parameter
OS10 for F
OSC
value
OS30 T
OSL,
T
OSH
External Clock In (OSC1)
High or Low Time
0.45 x T
OSC ——nsEC (Note 4)
OS31 T
OSR,
T
OSF
External Clock In (OSC1)
Rise or Fall Time
——0.05 x T
OSC ns EC (Note 4)
OS40 T
OST Oscillator Start-up Timer Period
(Only applies to HS, HSPLL,
XT, XTPLL and S
OSC Clock
Oscillator modes)
—1024—T
OSC (Note 4)
OS41 T
FSCM Primary Clock Fail Safe 
Time-out Period
—2—ms(Note 4)
OS42 G
M External Oscillator
Transconductance (Primary
Oscillator only)
—12—mA/VV
DD = 3.3V,
T
A = +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 (T
CY) 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 MH
Z  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.
5: For Industrial devices (-40°C  TA  +85°C), the maximum value is 80 MHz