Datasheet

 2010 Microchip Technology Inc. DS41326E-page 91
PIC16F526
FIGURE 14-4: EXTERNAL CLOCK TIMING
TABLE 14-6: EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions (unless otherwise specified)
Operating Temperature -40C  T
A  +85C (industrial),
-40C  T
A  +125C (extended)
Operating Voltage V
DD range is described in Section 14.1 “DC
Characteristics: PIC16F526 (Industrial)”
Param
No.
Sym. Characteristic Min. Typ.
(1)
Max. Units Conditions
1A F
OSC External CLKIN Frequency
(2)
DC — 4 MHz XT Oscillator mode
DC — 20 MHz HS/EC Oscillator mode
DC — 200 kHz LP Oscillator mode
Oscillator Frequency
(2)
— — 4 MHz EXTRC Oscillator mode
0.1 — 4 MHz XT Oscillator mode
4 — 20 MHz HS/EC Oscillator mode
— — 200 kHz LP Oscillator mode
1T
OSC External CLKIN Period
(2)
250 — — ns XT Oscillator mode
50 — — ns HS/EC Oscillator mode
5— —s LP Oscillator mode
Oscillator Period
(2)
250 — — ns EXTRC Oscillator mode
250 — 10,000 ns XT Oscillator mode
50 — 250 ns HS/EC Oscillator mode
5— —s LP Oscillator mode
2T
CY Instruction Cycle Time 200 4/FOSC —ns
3 TosL,
To sH
Clock in (OSC1) Low or High
Time
50* — — ns XT Oscillator
2* — — s LP Oscillator
10* — — ns HS/EC Oscillator
4TosR,
To sF
Clock in (OSC1) Rise or Fall
Time
— — 25* ns XT Oscillator
— — 50* ns LP Oscillator
— — 15* ns HS/EC Oscillator
* These parameters are characterized but not tested.
Note 1: Data in the Typical (“Typ”) column is at 5V, 25C unless otherwise stated. These parameters are for
design guidance only and are not tested.
2: 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. When an external clock
input is used, the “max” cycle time limit is “DC” (no clock) for all devices.
OSC1
Q4
Q1 Q2
Q3 Q4 Q1
133
44
2