Datasheet

PIC16C505
DS40192D-page 64  1999-2012 Microchip Technology Inc.
10.5 Timing Diagrams and Specifications
FIGURE 10-5: EXTERNAL CLOCK TIMING - PIC16C505
TABLE 10-2: EXTERNAL CLOCK TIMING REQUIREMENTS - PIC16C505
AC Characteristics Standard Operating Conditions (unless otherwise specified)
Operating Temperature 0C  T
A  +70C (commercial),
–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
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)
DC — 200 kHz LP osc mode
Oscillator Frequency
(2)
DC — 4 MHz EXTRC osc mode
0.1 — 4 MHz XT osc mode
4 — 4 MHz HS osc mode
(PIC16C505-04)
DC — 200 kHz LP osc mode
1T
OSC External CLKIN Period
(2)
250 — — ns XT osc mode
50 — — ns HS osc mode
(PIC16C505-20)
— — µs LP osc mode
Oscillator Period
(2)
250 — — 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——µsLP osc mode
2T
CY 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.
OSC1
Q4
Q1 Q2
Q3 Q4 Q1
133
44
2