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参数资料
| 型号： | MB90462P-SH |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP64 |
| 封装： | 1.78 MM PITCH, SHRINK, PLASTIC, DIP-64 |
| 文件页数： | 8/85页 |
| 文件大小： | 826K |
| 代理商： | MB90462P-SH |
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MB90460 Series
16
s
s HANDLING DEVICES
1.
Preventing Latchup
CMOS ICs may cause latchup in the following situations :
When a voltage higher than VCC or lower than VSS is applied to input or output pins.
When a voltage exceeding the rating is applied between VCC and VSS.
When AVCC power is supplied prior to the VCC voltage.
If latchup occurs, the power supply current increases rapidly, sometimes resulting in thermal breakdown of the
device. Use meticulous care not to let it occur.
For the same reason, also be careful not to let the analog power-supply voltage exceed the digital power-supply
voltage.
2.
Handling unused input pins
Unused input pins left open may cause abnormal operation, or latch-up leading to permanent damage. Unused
input pins should be pulled up or pulled down through at least 2 k
resistance.
Unused input/output pins may be left open in the output state, but if such pins are in the input state they should
be handled in the same way as input pins.
3.
Use of the external clock
When the device uses an external clock, drive only the X0 pin while leaving the X1 pin open (See the illustration
below) .
4.
Power Supply Pins (VCC/VSS)
In products with multiple VCC or VSS pins, the pins of a same potential are internally connected in the device to
avoid abnormal operations including latch-up. However, connect the pins external power and ground lines to
lower the electro-magnetic emission level to prevent abnormal operation of strobe signals caused by the rise in
the ground level, and to conform to the total current rating.
Make sure to connect VCC and VSS pins via the lowest impedance to power lines.
It is recommended to provide a bypass capacitor of around 0.1
F between VCC and VSS pins near the device.
5.
Crystal Oscillator Circuit
Noise around X0 or X1 pins may cause abnormal operations. Make sure to provide bypass capacitors via the
shortest distance from X0, X1 pins, crystal oscillator (or ceramic resonator) and ground lines, and make sure,
to the utmost effort, that lines of oscillation circuit not cross the lines of other circuits.
It is highly recommended to provide a printed circuit board art work surrounding X0 and X1 pins with the ground
area for stabilizing the operation.
6.
Turning-on Sequence of Power Supply to A/D Converter and Analog Inputs
Make sure to turn on the A/D converter power supply (AVCC, AVSS, AVR) and analog inputs (AN0 to AN7) after
turning-on the digital power supply (VCC) .
Turn-off the digital power after turning off the A/D converter supply and analog inputs. In this case, make sure
that the voltage of AVR dose not exceed AVCC (turning on/off the analog and digital power supplies simultaneously
is acceptable) .
X0
X1
Open
MB90460 series
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相关代理商/技术参数 |
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|---|---|
| MB90465 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
| MB90467 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
| MB90467PF | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
| MB90467PFM | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
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