參數(shù)資料
型號(hào)： PIC16LC433E/P
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP18
封裝： 0.300 INCH, PLASTIC, DIP-18
文件頁(yè)數(shù)： 72/122頁(yè)
文件大?。?/td> 1862K
代理商： PIC16LC433E/P
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2001 Microchip Technology Inc.
Advance Information
DS41139A-page 51
PIC16C433
9.2.3
EXTERNAL CRYSTAL OSCILLATOR
CIRCUIT
Either a pre-packaged oscillator, or a simple oscillator
circuit with TTL gates, can be used as an external crys-
tal oscillator circuit. Pre-packaged oscillators provide a
wide operating range and better stability. A well
designed crystal oscillator will provide good perfor-
mance with TTL gates. Two types of crystal oscillator
circuits can be used; one with parallel resonance, or
one with series resonance.
Figure 9-3 shows implementation of a parallel resonant
oscillator circuit. The circuit is designed to use the fun-
damental frequency of the crystal. The 74AS04 inverter
performs the 180-degree phase shift that a parallel
oscillator requires. The 4.7 k
resistor provides the
negative feedback for stability. The 10 k
potentiome-
ters bias the 74AS04 in the linear region. This circuit
could be used for external oscillator designs.
FIGURE 9-3:
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
Figure 9-4 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental fre-
quency of the crystal. The inverter performs a 180-
degree phase shift in a series resonant oscillator cir-
cuit. The 330
resistors provide the negative feedback
to bias the inverters in their linear region.
FIGURE 9-4:
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
9.2.4
EXTERNAL 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 (REXT) and capacitor (CEXT) values, and the operat-
ing temperature. In addition to this, the oscillator
frequency will vary from unit to unit, due to normal pro-
cess parameter variation. Furthermore, the difference
in lead frame capacitance between package types will
also affect the oscillation frequency, especially for low
CEXT values. The user also needs to take into account
variation due to tolerance of external R and C compo-
nents used.
Figure 9-5 shows how the R/C combination is con-
nected to the PIC16C433. For REXT values below
2.2 k
, the oscillator operation may become unstable
or stop completely. For very high REXT values
(i.e., 1 M
), the oscillator becomes sensitive to noise,
humidity and leakage. Thus, we recommend keeping
REXT between 3 k
and 100 k.
Although the oscillator will operate with no external
capacitor (CEXT = 0 pF), we recommend using values
above 20 pF for noise and stability reasons. With no or
small external capacitance, the oscillation frequency
can vary dramatically due to changes in external
capacitances, such as PCB trace capacitance or pack-
age lead frame capacitance.
The variation is greater for larger R (since leakage cur-
rent variation will affect RC frequency more for large R)
and for smaller C (since variation of input capacitance
will affect RC frequency more).
FIGURE 9-5:
EXTERNAL RC OSCILLATOR
MODE
20 pF
+5V
20 pF
10k
4.7k
10k
74AS04
XTAL
10k
74AS04
PIC16C433
CLKIN
To Other
Devices
330
74AS04
PIC16C433
CLKIN
To Other
Devices
XTAL
330
74AS04
0.1
F
VDD
REXT
CEXT
VSS
OSC1
Internal
Clock
PIC16C433
N
OSC2/CLKOUT
FOSC/4
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16LC433-I/P 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16LC433-I/SO 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16LC433T-I/SO 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16LC505-04/P 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz PDIP14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16LC505-04/SL 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz SOIC14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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