PIC16F627A Datasheet, PDF (142/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

PIC16F627A/628A/648A
17.6 Timing Diagrams and Specifications
FIGURE 17-4:
EXTERNAL CLOCK TIMING
Q4
OSC1
CLKOUT
Q1
Q2
Q3
1
3
3
2
Q4
Q1
4
4
TABLE 17-4: EXTERNAL CLOCK TIMING REQUIREMENTS
Parameter
No.
Sym
Characteristic
Min Typ† Max Units
Conditions
Fosc External CLKIN Frequency⁽¹⁾ DC
—
DC
—
Oscillator Frequency⁽¹⁾
DC
—
—
—
0.1
—
1
—
—
—
—
4
1
Tosc External CLKIN Period⁽¹⁾
—
37
250
—
50
—
Oscillator Period⁽¹⁾
5
—
250
—
250
—
50
—
5
—
—
250
—
27
2
Tcy Instruction Cycle Time
1.0
TCY
3
TosL, External CLKIN (OSC1) High 100* —
TosH External CLKIN Low
4
RC External Biased RC Fre-
10 kHz* —
quency
* These parameters are characterized but not tested.
4
20
200
4
4
20
200
—
—
—
—
—
—
10,000
1,000
—
—
—
DC
—
4 MHz
MHz XT and RC Osc mode,
VDD = 5.0 V
MHz HS Osc mode
kHz LP Osc mode
MHz RC Osc mode, VDD = 5.0V
MHz XT Osc mode
MHz HS Osc mode
kHz LP Osc mode
MHz INTOSC mode (fast)
kHz INTOSC mode (slow)
ns XT and RC Osc mode
ns HS Osc mode
µs LP Osc mode
ns RC Osc mode
ns XT Osc mode
ns HS Osc mode
µs LP Osc mode
ns INTOSC mode (fast)
µs INTOSC mode (slow)
ns TCY = 4/FOSC
ns XT oscillator, TOSC L/H duty
cycle
— VDD = 5.0V
† Data in “Typ” column is at 5.0V, 25°C unless otherwise stated. These parameters are for design guidance only
and are not tested.
Note:
Instruction cycle period (Tcy) equals four times the input oscillator time-based 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 oper-
ation and/or higher than expected current consumption. All devices are tested to operate at “Min” values
with an external clock applied to the OSC1 pin. When an external clock input is used, the “Max” cycle time
limit is “DC” (no clock) for all devices.
DS40044A-page 140
Preliminary
 2002 Microchip Technology Inc.