PIC16C505
10.5 Timing Diagrams and Specifications
FIGURE 10-5: EXTERNAL CLOCK TIMING - PIC16C505
Q4
OSC1
Q1
Q2
Q3
1
3
3
2
Q4
Q1
4
4
TABLE 10-2: EXTERNAL CLOCK TIMING REQUIREMENTS - PIC16C505
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 10.1
Parameter
No.
Sym
Characteristic
Min Typ(1) Max Units
Conditions
1A
FOSC
External CLKIN Frequency(2)
DC —
4 MHz XT osc mode
DC —
4 MHz HS osc mode
(PIC16C505-04)
DC —
20 MHz HS osc mode
(PIC16C505-20)
Oscillator Frequency(2)
DC — 200 kHz LP osc mode
DC —
4 MHz EXTRC osc mode
0.1 —
4 MHz XT osc mode
4
—
4 MHz HS osc mode
(PIC16C505-04)
1
TOSC
External CLKIN Period(2)
DC —
250 —
200 kHz LP osc mode
—
ns XT osc mode
50
—
—
ns HS osc mode
(PIC16C505-20)
Oscillator Period(2)
—
250 —
—
µs LP osc mode
—
ns EXTRC osc mode
250 — 10,000 ns XT osc mode
250 —
250 ns HS ocs mode
(PIC16C505-04)
50
—
250 ns HS ocs mode
(PIC16C505-20)
5
—
—
µs LP osc mode
2
TCY
Instruction Cycle Time
— 4/FOSC DC ns
200 —
ns
* 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 condi-
tions 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.
DS40192C-page 66
© 1999 Microchip Technology Inc.