
PIC16F87X
DS30292C-page 162
2001 Microchip Technology Inc.
FIGURE 15-6:
EXTERNAL CLOCK TIMING
OSC1
CLKOUT
Q4
Q1
Q2
Q3
Q4
Q1
1
2
3
3
4
4
TABLE 15-1:
EXTERNAL CLOCK TIMING REQUIREMENTS
Parameter
No.
Sym
Characteristic
Min
Typ
Max
Units
Conditions
F
OSC
External CLKIN Frequency
(Note 1)
DC
DC
DC
DC
DC
DC
0.1
4
4
5
250
250
100
50
5
250
250
250
100
50
5
200
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
T
CY
4
4
10
20
200
4
4
10
20
200
—
—
—
—
—
—
10,000
—
250
250
—
DC
MHz
MHz
MHz
MHz
kHz
MHz
MHz
MHz
MHz
kHz
ns
ns
ns
ns
μ
s
ns
ns
ns
ns
ns
μ
s
ns
XT and RC osc mode
HS osc mode (-04)
HS osc mode (-10)
HS osc mode (-20)
LP osc mode
RC osc mode
XT osc mode
HS osc mode (-10)
HS osc mode (-20)
LP osc mode
XT and RC osc mode
HS osc mode (-04)
HS osc mode (-10)
HS osc mode (-20)
LP osc mode
RC osc mode
XT osc mode
HS osc mode (-04)
HS osc mode (-10)
HS osc mode (-20)
LP osc mode
T
CY
= 4/F
OSC
Oscillator Frequency
(Note 1)
1
T
OSC
External CLKIN Period
(Note 1)
Oscillator Period
(Note 1)
2
T
CY
Instruction Cycle Time
(Note 1)
External Clock in (OSC1) High or
Low Time
3
TosL,
TosH
100
2.5
15
—
—
—
—
—
—
—
—
—
—
—
—
25
50
15
ns
μ
s
ns
ns
ns
ns
XT oscillator
LP oscillator
HS oscillator
XT oscillator
LP oscillator
HS oscillator
4
TosR,
TosF
External Clock in (OSC1) Rise or
Fall Time
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 (T
CY
) 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 the OSC1/CLKIN pin. When an external clock input is used, the "max." cycle time
limit is "DC" (no clock) for all devices.