Datasheet

PIC12F508/509/16F505
DS41236B-page 74 Preliminary © 2005 Microchip Technology Inc.
TABLE 10-3: EXTERNAL CLOCK TIMING REQUIREMENTS – PIC12F508/509/16F505
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 10.1 "DC
Characteristics"
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 Oscillator mode (PIC16F505
only)
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 Oscillator mode (PIC16F505
only)
— — 200 kHz LP Oscillator mode
1T
OSC External CLKIN Period
(2)
250 — — ns XT Oscillator mode
50 — — ns HS Oscillator mode (PIC16F505
only)
5— —μs LP Oscillator mode
Oscillator Period
(2)
250 — — ns EXTRC Oscillator mode
250 — 10,000 ns XT Oscillator mode
50 — 250 ns HS Oscillator mode (PIC16F505
only)
5— —μs LP Oscillator mode
2T
CY Instruction Cycle Time 200 4/FOSC —ns
3 TosL,
TosH
Clock in (OSC1) Low or High
Time
50* — — ns XT Oscillator
2* — — μs LP Oscillator
10* — — ns HS Oscillator (PIC16F505 only)
4TosR,
TosF
Clock in (OSC1) Rise or Fall
Time
— — 25* ns XT Oscillator
— — 50* ns LP Oscillator
— — 15* ns HS Oscillator (PIC16F505 only)
* 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.