PIC17C756A MICROCHIP [Microchip Technology], PIC17C756A Datasheet - Page 18

• Manufacturer Part Number: PIC17C756A
• Description: High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

PIC17C7XX
FIGURE 4-2:
TABLE 4-1:
DS30289B-page 18
Higher capacitance increases the stability of the oscillator,
but also increases the start-up time. These values are for
design guidance only. Since each resonator has its own
characteristics, the user should consult the resonator manu-
facturer for appropriate values of external components.
Note 1: These values include all board capacitances on
Resonators Used:
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
16.0 MHz
Resonators used did not have built-in capacitors.
See Table 4-1 and Table 4-2 for recommended values of C1
and C2.
Note 1:
Oscillator
Type
XT
LF
C1
C2
A series resistor (Rs) may be required for AT strip
cut crystals.
this pin. Actual capacitor value depends on
board capacitance.
Panasonic EFO-A455K04B
Murata Erie CSA2.00MG
Murata Erie CSA4.00MG
Murata Erie CSA8.00MT
Murata Erie CSA16.00MX
(Note 1)
XTAL
CAPACITOR SELECTION FOR
Frequency
CERAMIC RESONATORS
Resonator
16.0 MHz
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
OSC1
OSC2
CRYSTAL OR CERAMIC
RESONATOR OPERATION
(XT OR LF OSC
CONFIGURATION)
PIC17CXXX
RF
Capacitor Range
33 - 100 pF
33 - 100 pF
C1 = C2
15 - 68 pF
10 - 33 pF
22 - 68 pF
SLEEP
To internal
logic
(1)
0.3%
0.5%
0.5%
0.5%
0.5%
FIGURE 4-3:
TABLE 4-2:
Higher capacitance increases the stability of the oscillator,
but also increases the start-up time and the oscillator cur-
rent. These values are for design guidance only. R
required in XT mode to avoid overdriving the crystals with
low drive level specification. Since each crystal has its own
characteristics, the user should consult the crystal manufac-
turer for appropriate values for external components.
Note 1: Overtone crystals are used at 24 MHz and
Crystals Used:
32.768 kHz
1.0 MHz
2.0 MHz
4.0 MHz
8.0 MHz
16.0 MHz
25 MHz
32 MHz
Type
Osc
XT
LF
C2
C3
C1
0.1 F
To filter the fundamental frequency:
Where f = tank circuit resonant frequency. This should be
midway between the fundamental and the 3rd overtone
frequencies of the crystal.
C3 blocks DC current to ground.
2: These values include all board capacitances on
L1*C2
1
higher. The circuit in Figure 4-3 should be used
to select the desired harmonic frequency.
this pin. Actual capacitor value depends on
board capacitance.
24 MHz
32 MHz
16 MHz
= (2 f)
32 kHz
1 MHz
2 MHz
2 MHz
4 MHz
8 MHz
Freq
Epson C-001R32.768K-A
ECS-10-13-1
ECS-20-20-1
ECS-40-20-1
ECS ECS-80-S-4
ECS-80-18-1
ECS-160-20-1
CTS CTS25M
CRYSTEK HF-2
L1
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
OSC1
OSC2
2
(1)
(1)
CRYSTAL OPERATION,
OVERTONE CRYSTALS
(XT OSC
CONFIGURATION)
100-150 pF
47-100 pF
10-68 pF
10-68 pF
15-68 pF
15-47 pF
15-47 pF
15-47 pF
10-47 pF
2000 Microchip Technology Inc.
C1
PIC17CXXX
(2)
100-150 pF
47-100 pF
10-68 pF
10-68 pF
15-68 pF
15-47 pF
15-47 pF
15-47 pF
10-47 pF
C2
SLEEP
S
20 PPM
50 PPM
50 PPM
50 PPM
50 PPM
50 PPM
50 PPM
50 PPM
(2)
may be