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| 型号： | KSZ8863FLLI |
| 厂商： | Micrel Inc |
| 文件页数： | 65/106页 |
| 文件大小： | 0K |
| 描述： | IC ETHERNET SWITCH 3PORT 48-LQFP |
| 标准包装： | 250 |
| 控制器类型： | 以太网开关控制器 |
| 接口： | MII |
| 电源电压： | 1.8V，2.5V，3.3V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 托盘 |
| 配用： | 576-3866-ND - BOARD EVALUATION FOR KSZ8863FLL |
| 其它名称： | 576-3750 |
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PIC16C72 Series
DS39016A-page 60
Preliminary
1998 Microchip Technology Inc.
10.2
Oscillator Congurations
10.2.1
OSCILLATOR TYPES
The PIC16CXXX family can be operated in four differ-
ent oscillator modes. The user can program two cong-
uration bits (FOSC1 and FOSC0) to select one of these
four modes:
LP
Low Power Crystal
XT
Crystal/Resonator
HS
High Speed Crystal/Resonator
RC
Resistor/Capacitor
10.2.2
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
In XT, LP or HS modes a crystal or ceramic resonator
is connected to the OSC1/CLKIN and OSC2/CLKOUT
pins
to
establish
oscillation
The
PIC16CXXX family oscillator design requires the use of
a parallel cut crystal. Use of a series cut crystal may
give a frequency out of the crystal manufacturers spec-
ications. When in XT, LP or HS modes, the device can
have an external clock source to drive the OSC1/
CLKIN pin (Figure 10-3).
FIGURE 10-2: CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
OSC CONFIGURATION)
FIGURE 10-3: EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR LP
OSC CONFIGURATION)
TABLE 10-1
CERAMIC RESONATORS
TABLE 10-2
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
Note1:
See Table 10-1 and Table 10-2 for recom-
mended values of C1 and C2.
2:
A series resistor (RS) may be required for
AT strip cut crystals.
3:
RF varies with the crystal chosen.
C1(1)
C2(1)
XTAL
OSC2
OSC1
RF(3)
SLEEP
To
logic
PIC16CXXX
RS(2)
internal
OSC1
OSC2
Open
Clock from
ext. system
PIC16CXXX
Ranges Tested:
Mode
Freq
OSC1
OSC2
XT
455 kHz
2.0 MHz
4.0 MHz
68 - 100 pF
15 - 68 pF
68 - 100 pF
15 - 68 pF
HS
8.0 MHz
16.0 MHz
10 - 68 pF
10 - 22 pF
10 - 68 pF
10 - 22 pF
These values are for design guidance only. See
notes at bottom of page.
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%
All resonators used did not have built-in capacitors.
Osc Type
Crystal
Freq
Cap. Range
C1
Cap. Range
C2
LP
32 kHz
33 pF
200 kHz
15 pF
XT
200 kHz
47-68 pF
1 MHz
15 pF
4 MHz
15 pF
HS
4 MHz
15 pF
8 MHz
15-33 pF
20 MHz
15-33 pF
These values are for design guidance only. See
notes at bottom of page.
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: Recommended values of C1 and C2 are
identical to the ranges tested (Table 10-1).
2: Higher capacitance increases the stability
of oscillator but also increases the start-up
time.
3: Since each resonator/crystal has its own
characteristics, the user should consult the
resonator/crystal manufacturer for appropri-
ate values of external components.
4: Rs may be required in HS mode as well as
XT mode to avoid overdriving crystals with
low drive level specication.
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