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2005 Microchip Technology Inc.
Preliminary
DS41265A-page 239
PIC16F946
19.6
AC Characteristics: PIC16F946 (Industrial, Extended)
FIGURE 19-3:
EXTERNAL CLOCK TIMING
TABLE 19-1:
EXTERNAL CLOCK TIMING REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Operating Temperature
-40°C
≤ TA ≤ +125°C
Param
No.
Sym
Characteristic
Min
Typ
Max
Units
Conditions
FOSC
External CLKI Frequency(1)
DC
—
37
kHz
LP Oscillator mode
DC
—
4
MHz
XT Oscillator mode
DC
—
20
MHz
HS Oscillator mode
DC
—
20
MHz
EC Oscillator mode
Oscillator Frequency(1)
5
—
37
kHz
LP Oscillator mode
—
4
—
MHz
INTOSC mode
DC
—
4
MHz
RC Oscillator mode
0.1
—
4
MHz
XT Oscillator mode
1
—
20
MHz
HS Oscillator mode
1TOSC
External CLKI Period(1)
27
—
∞μs
LP Oscillator mode
50
—
∞
Ns
HS Oscillator mode
50
—
∞
ns
EC Oscillator mode
250
—
∞
ns
XT Oscillator mode
Oscillator Period(1)
27
200
μs
LP Oscillator mode
—
250
—
ns
INTOSC mode
250
—
ns
RC Oscillator mode
250
—
10,000
ns
XT Oscillator mode
50
—
1,000
ns
HS Oscillator mode
2TCY
Instruction Cycle Time(1)
200
TCY
DC
ns
TCY = 4/FOSC
3TosL,
TosH
External CLKI (OSC1) High
External CLKI Low
2*
—
μs
LP oscillator, TOSC L/H duty cycle
20*
—
ns
HS oscillator, TOSC L/H duty cycle
100 *
—
ns
XT oscillator, TOSC L/H duty cycle
4TosR,
TosF
External CLKI Rise
External CLKI Fall
—
50*
ns
LP oscillator
—
25*
ns
XT oscillator
—
15*
ns
HS oscillator
*
These parameters are characterized but not tested.
Data in ‘Typ’ column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1:
Instruction cycle period (TCY) equals four 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 OSC1 pin. When an external clock input is used, the ‘max’ cycle
time limit is ‘DC’ (no clock) for all devices.
OSC1
CLKO
Q4
Q1
Q2
Q3
Q4
Q1
1
2
3
4
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