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參數(shù)資料
| 型號(hào)： | UPD75212ACW |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機(jī) |
| 文件頁(yè)數(shù)： | 48/70頁(yè) |
| 文件大小： | 516K |
| 代理商： | UPD75212ACW |
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48
μ
PD75212A
X1
X2
C1
C2
X1
X2
C1
C2
MAIN SYSTEM CLOCK OSCILLATOR CHARACTERISTICS (Ta = –40 to +85
°
C, V
DD
= 2.7 to 6.0 V )
V
DD
= Oscillation
voltage range
After V
DD
reaches the
minimum value in
the oscillation
voltage range
V
DD
= 4.5 to 6.0 V
Oscillator frequency
(f
XX
)
*2
Oscillation
stabilization time
*3
Oscillator frequency
(f
XX
)
*2
Oscillation stabilization
time
*3
X1 input frequency
(f
X
)
*2
X1 input high and low
level widths (t
XH
, t
XL
)
X1
X2
μ
PD74HCU04
2.0
2.0
2.0
100
4.19
5.0
*4
4
5.0
*4
10
30
5.0
*4
250
MHz
ms
MHz
ms
ms
MHz
ns
MIN.
TYP.
MAX.
UNIT
TEST CONDITIONS
PARAMETER
RECOMMENDED CIRCUIT
RESONATOR
Ceramic
resonator
*1
Crystal
resonator
*1
External
clock
*
1.
Refer to
RECOMMENDED OSCILLATOR CONSTANTS
.
2.
Oscillator characteristics only. Refer to the description of AC characteristics for details of instruction execution
time.
3.
Time required for oscillation to become stabilized after V
DD
reaches the minimum value in the oscillation
voltage range or STOP mode release.
4.
When oscillator frequency is “4.19 < f
XX
< 5.0 MHz”, do not select “PCC = 0011” as instruction execution time.
If “PCC = 0011” is selected, 1 machine cycle becomes less than 0.95
μ
s, with the result that the specified MIN.
value of 0.95
μ
s cannot be observed.
Note
When the main system clock oscillator is used, the following should be noted concerning wiring in the area
in the figure enclosed by a dotted line to prevent the influence of wiring capacitance, etc.
The wiring should be kept as short as possible.
No other signal lines should be crossed. Keep away from lines carrying a high fluctuating current.
The oscillator capacitor grounding point should always be at the same potential as V
SS
. Do not connect
to a ground pattern carrying a high current.
A signal should not be taken from the oscillator.
#
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