Datasheet

PIC16F630/676
DS40039E-page 94 © 2007 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 —MHzINTOSC mode
DC — 4 MHz RC Osc mode
0.1 — 4 MHz XT Osc mode
1— 20MHzHS Osc mode
1T
OSC External CLKIN Period
(1)
27 — ∞μsLP Osc mode
50 — ∞ ns HS Osc mode
50 — ∞ ns EC Osc mode
250 — ∞ ns XT Osc mode
Oscillator Period
(1)
27 200 μsLP Osc mode
—250 — nsINTOSC mode
250 — — ns RC Osc mode
250 — 10,000 ns XT Osc mode
50 — 1,000 ns HS Osc mode
2T
CY
Instruction Cycle Time
(1)
200 TCY DC ns TCY = 4/FOSC
3 TosL,
TosH
External CLKIN (OSC1) High
External CLKIN Low
2* — — μs LP oscillator, TOSC L/H duty cycle
20* — — ns HS oscillator, T
OSC L/H duty cycle
100 * — — ns XT oscillator, TOSC L/H duty cycle
4TosR,
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.
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 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