
PIC16F630/676
DS40039C-page 96
2003 Microchip Technology Inc.
12.9
AC CHARACTERISTICS: PIC16F630/676 (INDUSTRIAL, EXTENDED)
FIGURE 12-5:
EXTERNAL CLOCK TIMING
TABLE 12-1:
EXTERNAL CLOCK TIMING REQUIREMENTS
Param
No.
Sym
Characteristic
Min
Typ
Max
Units
Conditions
F
OSC
External CLKIN Frequency
(1)
DC
—
37
kHz
LP Osc mode
DC
—
4
MHz
XT mode
DC
—
20
MHz
HS mode
DC
—
20
MHz
EC mode
Oscillator Frequency
(1)
5
—
37
kHz
LP Osc mode
—
4
—
MHz
INTOSC mode
DC
—
4
MHz
RC Osc mode
0.1
—
4
MHz
XT Osc mode
1
—
20
MHz
HS Osc mode
1
T
OSC
External CLKIN Period
(1)
27
—
∞
∞
∞
∞
μ
s
LP Osc mode
50
—
ns
HS Osc mode
50
—
ns
EC Osc mode
250
—
ns
μ
s
XT Osc mode
Oscillator Period
(1)
27
200
LP Osc mode
—
250
—
ns
INTOSC mode
250
—
—
ns
RC Osc mode
250
—
10,000
ns
XT Osc mode
50
—
1,000
ns
HS Osc mode
2
T
CY
Instruction Cycle Time
(1)
200
T
CY
DC
ns
μ
s
T
CY
= 4/F
OSC
3
TosL,
TosH
External CLKIN (OSC1) High
External CLKIN Low
2*
—
—
LP oscillator, T
OSC
L/H duty cycle
20*
—
—
ns
HS oscillator, T
OSC
L/H duty cycle
100 *
—
—
ns
XT oscillator, T
OSC
L/H duty cycle
4
TosR,
TosF
External CLKIN Rise
External CLKIN 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.
Note1:
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 OSC1 pin. When an external clock input is used, the ‘max’ cycle time limit is ‘DC’ (no clock)
for all devices.
OSC1
CLKOUT
Q4
Q1
Q2
Q3
Q4
Q1
1
2
3
3
4
4