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UPD75P4308GS bảng dữ liệu(PDF) 33 Page - NEC

tên linh kiện UPD75P4308GS
Giải thích chi tiết về linh kiện  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  60 Pages
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nhà sản xuất  NEC [NEC]
Trang chủ  http://www.nec.com/
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UPD75P4308GS bảng dữ liệu(HTML) 33 Page - NEC

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µPD75P4308
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System Clock Oscillation Circuit Characteristics (TA = –40 to +85˚C, VDD = 1.8 to 5.5. V)
Resonator
Recommended
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
constants
Ceramic
Oscillation frequency
1.0
6.0Note 3
MHz
resonator
(fX)Note 1
Oscillation
After VDD has
4
ms
stabilization timeNote 2
reached MIN. value of
oscillation voltage
range
Crystal
Oscillation frequency
1.0
6.0Note 3
MHz
resonator
(fX)Note 1
Oscillation
VDD = 5.0 V
± 10 %
10
ms
stabilization timeNote 2
30
ms
External
X1 input frequency
1.0
6.0Note 3
MHz
clock
(fX)Note 1
X1 input high-,
83.3
500
ns
low-level widths
(tXH, tXL)
Notes 1. The oscillation frequency and X1 input frequency shown above indicate characteristics of the oscillation
circuit only. For the instruction execution time, refer to AC Characteristics.
2. The oscillation stabilization time is necessary for oscillation to stabilize after applying VDD or releasing
the STOP mode.
3. When the oscillation frequency fX satisfies 4.19 MHz < fX
≤ 6.0 MHz at 1.8 V ≤ VDD < 2.7 V, do not set
PCC = 0011 as an instruction execution time. If PCC = 0011 is selected, one machine cycle takes less
than 0.95
µs, and the MIN. value rating of 0.95 µs is not satisfied.
Caution When using the system clock oscillation circuit, wire the portion enclosed in the dotted line in
the above figure as follows to prevent adverse influence due to wiring capacitance:
·
Keep the wiring length as short as possible.
·
Do not cross the wiring with other signal lines.
·
Do not route the wiring in the vicinity of a line through which a high alternating current flows.
·
Always keep the ground point of the capacitor of the oscillation circuit at the same potential
as VSS. Do not ground to a ground pattern through which a high current flows.
·
Do not extract signals from the oscillation circuit.
X1
X2
X1
X2
C1
C2
X1
X2
C1
C2



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