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| 型号： | M37481M8T-XXXSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | 0.600 INCH, 1.78 MM PITCH, SHRINK, PLASTIC, DIP-42 |
| 文件页数： | 59/100页 |
| 文件大小： | 1457K |
| 代理商： | M37481M8T-XXXSP |
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MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
58
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
Table 13. Recommended operating conditions (cont.)
Symbol
Parameter
Standard values
Min.
Typ.
Max.
Unit
1
2
250
500
1
2
2.2VCC –2
8
f(CNTR)
f(SCLK)
f(XIN)
f(XIN) = 4 MHz
f(XIN) = 8 MHz
f(XIN) = 4 MHz
f(XIN) = 8 MHz
f(XIN) = 4 MHz
f(XIN) = 8 MHz
VCC = 2.7 to 4.5 V
VCC = 4.5 to 5.5 V
MHz
kHz
MHz
Timer input frequency CNTR0 (P40),
CNTR1 (P41) (Note 3)
Clock input oscillation frequency (Note 3)
Serial I/O clock input
frequency SCLK (P16)
(Note 3)
Clock synchronous
serial I/O mode
UART mode
Notes 1 : –40 to 85 °C for extended operating temperature range version.
2 : The average output currents IOH(avg) and IOL(avg) are the average values during 100 ms.
3 : The clock input oscillation frequency is at 50 % duty ratio.
4 : When applying a voltage through a resistor as shown in the figure 55, VI > VCC may be accepted if the current is 1 mA or less.
Fig. 55 Notes on use of ports P4 and P5
Notes on Clamp Diode (7481 Group)
(1) Total input current
The current of ports P4 and P5 through the clamp diode can
be drawn up to 1.0 mA per port. When a current that cannot be
consumed by microcomputer is sent flow to the clamp diode,
this may raise the power source pin voltage of the microcom-
puter.
The system power circuit must be designed so that the power
source voltage of the microcomputer may be stabilized within
the standard values.
(2) Maximum input voltage
If the input voltage of a signal connected to ports P4 and P5 is
beyond VCC + 0.3 V, the input waveform should have a delay
exceeding 2
s/V from the moment that this waveform goes
over the voltage.
For using a CR circuit for delay, calculate a proper delay value
by the following expression:
where VIN = Maximum input voltage amplitude margin and
t = C ! R.
dt
dv
=≥ 2 ! 10–6 (s/V)
t
0.6 ! VIN
Port P4, P5
I
VI
The clamp diode of the 7480/7481 group is designed for a level
shift of DC signal unlike ordinary switching diodes. Do not apply
sudden stress, such as rush current, directly to the diode.
Notes on Countermeasures for Noise and
Latch-up (7481 Group)
(1) Connect a bypass capacitor (0.1
F) across the VCC pin and
the VSS pin with the shortest possible wiring, using a relatively
thick wire.
(2) Connect a bypass capacitor (0.01
F) across the VREF pin and
the VSS pin with the shortest possible wiring, using a relatively
thick wire.
(3) In the oscillation circuit, connect across the XIN and XOUT pins
with the shortest possible wiring. Connect the GND and VSS
pins of the oscillation circuit with the shortest possible wiring,
using a relatively thick wire.
(4) In the case of the P33/VPP pin of the built-in programmable
ROM version, connect an approximately 5 k
resistor to the
P33/VPP pin the shortest possible in series.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37481M8-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37481M8-XXXSP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37481MT-088FP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481MXT | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481MXT-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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