PIC16C71X
Applicable Devices 710 71 711 715
FIGURE 12-22: TYPICAL XTAL STARTUP
FIGURE 12-24: TYPICAL XTAL STARTUP
TIME vs. VDD (LP MODE, 25°C)
TIME vs. VDD (XT MODE, 25°C)
3.5
3.0
2.5
70
60
50
2.0
40
200 kHz, 68 pF/68 pF
32 kHz, 33 pF/33 pF
1.5
30
200 kHz, 47 pF/47 pF
20
1.0
1 MHz, 15 pF/15 pF
10
4 MHz, 15 pF/15 pF
0.5
0.0
200 kHz, 15 pF/15 pF
0
2.5
3.0
3.5
4.0
VDD(Volts)
4.5
5.0
5.5
6.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD(Volts)
FIGURE 12-23: TYPICAL XTAL STARTUP
TIME vs. VDD (HS MODE,
25°C)
TABLE 12-2: CAPACITOR SELECTION
FOR CRYSTAL
OSCILLATORS
Crystal
Freq
Cap. Range
C1
Cap. Range
C2
7
6
Osc Type
LP
32 kHz
200 kHz
200 kHz
1 MHz
33 pF
15 pF
33 pF
15 pF
20 MHz, 33 pF/33 pF
5
XT
HS
47-68 pF
15 pF
47-68 pF
15 pF
4
8 MHz, 33 pF/33 pF
4 MHz
15 pF
15 pF
3
20 MHz, 15 pF/15 pF
4 MHz
15 pF
15 pF
8 MHz, 15 pF/15 pF
2
8 MHz
15-33 pF
15-33 pF
15-33 pF
15-33 pF
20 MHz
1
4.0
4.5
5.0
5.5
6.0
VDD(Volts)
Crystals
Used
32 kHz
200 kHz
1 MHz
Epson C-001R32.768K-A
STD XTL 200.000KHz
ECS ECS-10-13-1
± 20 PPM
± 20 PPM
± 50 PPM
± 50 PPM
± 30 PPM
± 30 PPM
4 MHz
ECS ECS-40-20-1
8 MHz
EPSON CA-301 8.000M-C
EPSON CA-301 20.000M-C
20 MHz
DS30272A-page 108
1997 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
