Microchip Technology IC MCU OTP 4K PIC16C74B-20/L PLCC-44 MCP PIC16C74B-20/L 데이터 시트
제품 코드
PIC16C74B-20/L
1998-2013 Microchip Technology Inc.
DS30605D-page 87
PIC16C63A/65B/73B/74B
TABLE 13-1:
CERAMIC RESONATORS
TABLE 13-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
CRYSTAL OSCILLATOR
13.2.3
RC OSCILLATOR
For timing insensitive applications, the “RC” device
option offers additional cost savings. The RC oscillator
frequency is a function of the supply voltage, the resis-
tor (R
option offers additional cost savings. The RC oscillator
frequency is a function of the supply voltage, the resis-
tor (R
EXT
) and capacitor (C
EXT
) values, and the operat-
ing temperature. The oscillator frequency will vary from
unit to unit due to normal process variation. The differ-
ence in lead frame capacitance between package
types will also affect the oscillation frequency, espe-
cially for low C
unit to unit due to normal process variation. The differ-
ence in lead frame capacitance between package
types will also affect the oscillation frequency, espe-
cially for low C
EXT
values. The user also needs to take
into account variation due to tolerance of external R
and C components used. Figure 13-3 shows how the
R/C combination is connected to the PIC16CXX.
and C components used. Figure 13-3 shows how the
R/C combination is connected to the PIC16CXX.
The oscillator frequency, divided by 4, is available on
the OSC2/CLKOUT pin, and can be used for test pur-
poses or to synchronize other logic (see Figure 3-2 for
waveform).
the OSC2/CLKOUT pin, and can be used for test pur-
poses or to synchronize other logic (see Figure 3-2 for
waveform).
FIGURE 13-3:
RC OSCILLATOR MODE
Ranges Tested:
Mode
Freq
OSC1
OSC2
XT
455 kHz
2.0 MHz
4.0 MHz
2.0 MHz
4.0 MHz
68 - 100 pF
15 - 68 pF
15 - 68 pF
15 - 68 pF
68 - 100 pF
15 - 68 pF
15 - 68 pF
15 - 68 pF
HS
8.0 MHz
16.0 MHz
10 - 68 pF
10 - 22 pF
10 - 22 pF
10 - 68 pF
10 - 22 pF
10 - 22 pF
Note:
These values are for design guidance only.
See notes following Table 13-1 and Table 13-2.
See notes following Table 13-1 and Table 13-2.
Resonators Used:
455 kHz
Panasonic EFO-A455K04B
± 0.3%
2.0 MHz
Murata Erie CSA2.00MG
± 0.5%
4.0 MHz
Murata Erie CSA4.00MG
± 0.5%
8.0 MHz
Murata Erie CSA8.00MT
± 0.5%
16.0 MHz
Murata Erie CSA16.00MX
± 0.5%
Note:
Resonators used did not have built-in capacitors.
Osc Type
Crystal
Freq
Cap. Range
C1
Cap. Range
C2
LP
32 kHz
33 pF
33 pF
200 kHz
15 pF
15 pF
XT
200 kHz
47-68 pF
47-68 pF
1 MHz
15 pF
15 pF
4 MHz
15 pF
15 pF
HS
4 MHz
15 pF
15 pF
8 MHz
15-33 pF
15-33 pF
20 MHz
15-33 pF
15-33 pF
Note:
These values are for design guidance only.
See notes following Table 13-1 and Table 13-2.
See notes following Table 13-1 and Table 13-2.
Crystals Used:
32 kHz
Epson C-001R32.768K-A
± 20 PPM
200 kHz
STD XTL 200.000KHz
± 20 PPM
1 MHz
ECS ECS-10-13-1
± 50 PPM
4 MHz
ECS ECS-40-20-1
± 50 PPM
8 MHz
EPSON CA-301 8.000M-C
± 30 PPM
20 MHz
EPSON CA-301 20.000M-C
± 30 PPM
Note 1: Higher capacitance increases the stability
of the oscillator, but also increases the
start-up time.
start-up time.
2: Since each resonator/crystal has its own
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate values of external compo-
nents.
the resonator/crystal manufacturer for
appropriate values of external compo-
nents.
3: Rs may be required in HS mode, as well
as XT mode, to avoid overdriving crystals
with low drive level specification.
with low drive level specification.
4: Oscillator performance should be verified
at the expected voltage and temperature
extremes in which the application is
expected to operate.
extremes in which the application is
expected to operate.
OSC2/CLKOUT
C
EXT
V
DD
R
EXT
V
SS
PIC16CXX
OSC1
F
OSC
/4
Internal
Clock
Recommended Values: R
EXT
= 3 kW to 100 kW
C
EXT
= 20 pf to 30 pF