參數(shù)資料
型號(hào)： MTA81010-XT/SO
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28
封裝： 0.300 INCH, SOIC-28
文件頁數(shù)： 27/76頁
文件大?。?/td> 745K
代理商： MTA81010-XT/SO
1995 Microchip Technology Inc.
DS39005D-page 33
MTA81010
11.0
OSCILLATOR CIRCUITS
11.1
Oscillator Types
The MTA81010 series is available with three different
oscillator options. On OTP and QTP devices, the
oscillator configuration is programmed by the factory
and the parts are tested only to the according
specifications.
11.2
Crystal Oscillator
The MTA81010, -XT, or LP needs a crystal or ceramic
resonator connected to the OSC1 and OSC2 pins to
establish oscillation (Figure 11-1). XT = Standard
crystal oscillator, LP = low power crystal oscillator. The
series resistor RS may be required in XT mode with AT
strip-cut type crystals to avoid overdriving.
11.3
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
resistor (Rext) and capacitor (Cext) values, and the
operation temperature. In addition to this, the oscillator
frequency will vary from unit to unit due to normal
process
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 components used. Figure 11-3 shows how the
R/C combination is connected to the MTA81010. For
Rext values below 2.2 k
, the oscillator operation may
become unstable, or stop completely. For very high
Rext values (e.g., 1 M
), the oscillator becomes
sensitive to noise, humidity and leakage. Thus, we
recommend to keep Rext between 5 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
small external capacitance, the oscillation frequency
can vary dramatically due to changes in external
capacitances,
such as PCB trace capacitance or
package lead frame capacitance.
See Table 16-1 for RC frequency variation from part to
part due to normal process variation. The variation is
larger for larger R (since leakage current variation will
affect RC frequency more for large R) and for smaller C
(since variation of input capacitance will affect RC
frequency more).
See characteristics in Section 16.0 for variation of
oscillator frequency due to VDD for given Rext/Cext
values as well as frequency variation due to operating
temperature for given R, C, and VDD values.
相關(guān)PDF資料
PDF描述
MTA81010S-LPI/SO 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28
MTA81010-LPI/P 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP28
MTA81010S-RCI/SO 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28
MTA81010-XTI/P 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP28
MTA81010T-XT/SO 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28
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