PIC16C71X
Applicable Devices 710 71 711 715
11.5
Timing Diagrams and Specifications
FIGURE 11-2: EXTERNAL CLOCK TIMING
Q4
Q1
1
Q2
Q3
Q4
4
Q1
OSC1
3
3
4
2
CLKOUT
TABLE 11-2: EXTERNAL CLOCK TIMING REQUIREMENTS
Parameter Sym Characteristic
No.
Min
Typ†
Max
Units Conditions
Fosc External CLKIN Frequency
DC
DC
DC
DC
DC
DC
0.1
—
—
—
—
—
—
—
4
4
MHz XT osc mode
(Note 1)
MHz HS osc mode (-04)
MHz HS osc mode (-10)
MHz HS osc mode (-20)
kHz LP osc mode
10
20
200
4
Oscillator Frequency
(Note 1)
MHz RC osc mode
4
MHz XT osc mode
4
5
—
—
20
200
MHz HS osc mode
kHz LP osc mode
1
Tosc External CLKIN Period
250
250
100
50
—
—
—
—
—
—
—
—
—
—
ns
ns
ns
ns
µs
ns
ns
ns
XT osc mode
(Note 1)
HS osc mode (-04)
HS osc mode (-10)
HS osc mode (-20)
LP osc mode
—
—
5
—
Oscillator Period
(Note 1)
250
250
250
—
RC osc mode
10,000
250
XT osc mode
HS osc mode (-04)
100
50
—
—
250
250
ns
ns
HS osc mode (-10)
HS osc mode (-20)
5
—
—
—
—
—
—
—
—
—
DC
—
µs
ns
ns
µs
ns
ns
ns
ns
LP osc mode
TCY = 4/FOSC
XT oscillator
LP oscillator
HS oscillator
XT oscillator
LP oscillator
HS oscillator
2
3
TCY
Instruction Cycle Time (Note 1) 200
TosL, External Clock in (OSC1) High
TosH or Low Time
50
2.5
10
—
—
—
4
TosR, External Clock in (OSC1) Rise
TosF or Fall Time
25
50
15
—
—
†
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 the OSC1/CLKIN pin.
When an external clock input is used, the "Max." cycle time limit is "DC" (no clock) for all devices. OSC2 is disconnected
(has no loading) for the PIC16C710/711.
1997 Microchip Technology Inc.
DS30272A-page 95
MICROCHIP [ MICROCHIP ]
