參數(shù)資料
型號(hào)： MB91F155A
廠商： Fujitsu Limited
英文描述： 32-bit Proprietary Microcontrollers
中文描述： 32位微控制器專(zhuān)有
文件頁(yè)數(shù)： 15/105頁(yè)
文件大?。?/td> 989K
代理商： MB91F155A
MB91F155A/MB91155/MB91154
15
I
HANDLING DEVICES
1.
Preventing Latchup
In CMOS ICs, applying voltage higher than V
CC
or lower than V
SS
to input/output pin or applying voltage over
rating across V
CC
and V
SS
may cause latchup.
This phenomenon rapidly increases the power supply current, which may result in thermal breakdown of the
device. Make sure to prevent the voltage from exceeding the maximum rating.
Treatment of Pins
Treatment of unused pins
Unused pins left open may cause malfunctions. Make sure to connect them to pull-up or pull-down resistors.
Treatment of open pins
Be sure to use open pins in open state.
Treatment of output pins
Shortcircuiting an output pin with the power supply or with another output pin or connecting a large-capacity
load may causes a flow of large current. If this conditions continues for a lengthy period of time, the device
deteriorates. Take great care not to exceed the absolute maximum ratings.
Mode pins
(
MD0
-
MD2
)
These pins should be used directly connected to either V
CC
or V
SS
. In order to prevent noise from causing
accidental entry into test mode, keep the pattern length as short as possible between each mode pin and V
CC
or V
SS
on the board and connect them with low impedance.
Power supply pins
When there are several V
CC
and V
SS
pins, each of them is equipotentially connected to its counterpart inside
of the device, minimizing the risk of malfunctions such as latch up. To further reduce the risk of malfunctions,
to prevent EMI radiation, to prevent strobe signal malfunction resulting from creeping-up of ground level and
to observe the total output current standard, connect all V
CC
and V
SS
pins to the power supply or GND.
2.
It is preferred to connect V
CC
and V
SS
of MB91F155/MB91154 to power supply with minimal impedance possible.
It is also recommended to connect a ceramic capacitor as a bypass capacitor of about 0.1
μ
F between V
CC
and
V
SS
at a position as close as possible to MB91F155/MB91154.
Crystal oscillator circuit
Noises around X0, X1, X0A, and X1A pins may cause malfunctions of MB91F155/MB91154. In designing the
PC board, layout X0, X1 (X0A, X1A) and crystal oscillator (or ceramic oscillator) and bypass capacitor for
grounding as close as possible.
It is strongly recommended to design PC board so that X0, X1, X0A, and X1A pins are surrounded by grounding
area for stable operation.
The MB91F155A, MB91155 and MB91154 devices do not contain a feedback resistor. To use the clock function,
you need to connect an external resistor.
3.
Precautions
External Reset Input
It takes at least 5 machine cycle to input “L” level to the RST pin and to ensure inner reset operation properly.
External Clocks
When using an external clock, normally, a clock of which the phase is opposite to that of X0 must be supplied
to the X0 and X1 pins simultaneously. However, when using the clock along with STOP (oscillation stopped)
X0A
X1A
MB91F155A/MB91155/MB91154
相關(guān)PDF資料
PDF描述
MB91F155APF-G 32-bit Proprietary Microcontrollers
MB91F155APFV-G 32-bit Proprietary Microcontrollers
MB91155PFV-G 32-bit Proprietary Microcontrollers
MB91260B 32-bit Proprietary Microcontroller CMOS
MB91263B 32-bit Proprietary Microcontroller CMOS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB91F155APF-G 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:32-bit Proprietary Microcontrollers
MB91F155APFV-G 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:32-bit Proprietary Microcontrollers
MB91F155PFV-G 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:32-bit Proprietary Microcontrollers
MB91F158 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:32-bit Proprietary Microcontrollers
MB91F158PFF-G 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:32-bit Proprietary Microcontrollers
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