PIC16F/LF1946/47
29.8 AC Characteristics: PIC16F/LF1946/47-I/E
FIGURE 29-6:
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 29-1: 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
FOSC
TOSC
TCY
External CLKIN Frequency
DC
DC
DC
—
—
—
0.5
4
MHz EC Oscillator mode (low)
MHz EC Oscillator mode (medium)
MHz EC Oscillator mode (high)
—
32
—
4
(1)
Oscillator Frequency
32.768
—
kHz
LP Oscillator mode
0.1
1
MHz XT Oscillator mode
—
4
MHz HS Oscillator mode, VDD 2.5V
MHz HS Oscillator mode, VDD > 2.5V
MHz RC Oscillator mode
1
—
20
4
DC
27
—
(1)
OS02
External CLKIN Period
—
s
ns
ns
ns
s
ns
ns
ns
ns
s
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
250
50
—
—
31.25
—
—
(1)
Oscillator Period
30.5
—
—
10,000
1,000
—
DC
—
—
—
250
50
—
250
200
2
—
(1)
OS03
Instruction Cycle Time
TCY
—
OS04*
TosH,
TosL
External CLKIN High,
External CLKIN Low
LP oscillator
100
20
—
XT oscillator
—
HS oscillator
OS05*
TosR,
TosF
External CLKIN Rise,
External CLKIN Fall
0
—
LP oscillator
0
—
XT oscillator
0
—
HS oscillator
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 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 con-
sumption. 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.
DS41414A-page 396
Preliminary
2010 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
