PIC12C5XX
11.4
Timing Diagrams and Specifications
FIGURE 11-2: EXTERNAL CLOCK TIMING - PIC12C508/C509
Q4
Q3
Q4
4
Q1
Q1
Q2
OSC1
1
3
3
4
2
TABLE 11-2: EXTERNAL CLOCK TIMING REQUIREMENTS - PIC12C508/C509
AC Characteristics
Standard Operating Conditions (unless otherwise specified)
Operating Temperature
0°C ≤ TA ≤ +70°C (commercial),
–40°C ≤ TA ≤ +85°C (industrial),
–40°C ≤ TA ≤ +125°C (extended)
Operating Voltage VDD range is described in Section 11.1
Parameter
Sym
(1)
Characteristic
Min
Max Units
Conditions
Typ
No.
External CLKIN Frequency(2)
FOSC
DC
—
—
4
MHz XT osc mode
kHz LP osc mode
DC
200
Oscillator Frequency(2)
External CLKIN Period(2)
Oscillator Period(2)
0.1
DC
250
250
5
—
—
4
200
—
MHz XT osc mode
kHz LP osc mode
ns EXTRC osc mode
ns XT osc mode
ms LP osc mode
ns EXTRC osc mode
ns XT osc mode
ms LP osc mode
—
1
TOSC
—
—
—
—
—
250
250
5
—
—
—
10,000
—
—
Instruction Cycle Time(3)
2
3
Tcy
—
4/FOSC
—
TosL, TosH Clock in (OSC1) Low or High Time
TosR, TosF Clock in (OSC1) Rise or Fall Time
These parameters are characterized but not tested.
50*
2*
—
—
—
—
—
—
ns XT oscillator
ms LP oscillator
ns XT oscillator
ns LP oscillator
4
—
25*
50*
—
*
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 oper-
ating 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.
3: Instruction cycle period (TCY) equals four times the input oscillator time base period.
DS40139E-page 70
1999 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
