PIC16F688
14.8 AC Characteristics: PIC16F688 (Industrial, Extended)
FIGURE 14-4:
CLOCK TIMING
Q4
Q1
Q2
Q3
Q4
Q1
OSC1/CLKIN
OS02
OS04
OS04
OS03
OSC2/CLKOUT
(LP, XT, HS Modes)
OSC2/CLKOUT
(CLKOUT Mode)
TABLE 14-1: CLOCK OSCILLATOR TIMING REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Operating temperature
-40°C ≤ TA ≤ +125°C
Param
Sym
No.
Characteristic
Min
Typ†
Max
Units
Conditions
(1)
OS01
OS02
OS03
FOSC
TOSC
TCY
External CLKIN Frequency
DC
DC
DC
DC
—
—
—
37
kHz LP Oscillator mode
MHz XT Oscillator mode
MHz HS Oscillator mode
MHz EC Oscillator mode
kHz LP Oscillator mode
MHz XT Oscillator mode
MHz HS Oscillator mode
MHz RC Oscillator mode
4
—
20
—
20
(1)
Oscillator Frequency
32.768
—
—
0.1
1
4
—
20
DC
27
250
50
50
—
—
4
(1)
External CLKIN Period
—
•
μs
ns
ns
ns
μs
ns
ns
ns
ns
μs
ns
ns
ns
ns
ns
LP Oscillator mode
XT Oscillator mode
HS Oscillator mode
EC Oscillator mode
LP Oscillator mode
XT Oscillator mode
HS Oscillator mode
RC Oscillator mode
TCY = 4/FOSC
—
•
—
•
—
•
(1)
Oscillator Period
30.5
—
—
250
50
250
200
2
10,000
—
1,000
—
DC
—
—
—
•
—
(1)
Instruction Cycle Time
TCY
—
OS04* TosH, External CLKIN High,
TosL External CLKIN Low
LP oscillator
100
20
0
—
XT oscillator
—
HS oscillator
OS05* TosR, External CLKIN Rise,
TosF External CLKIN Fall
—
LP oscillator
0
—
•
XT oscillator
0
—
•
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.
© 2007 Microchip Technology Inc.
DS41203D-page 153
MICROCHIP [ MICROCHIP ]
