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參數(shù)資料
| 型號： | MSM6542-01 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT |
| 中文描述： | 實時時鐘周期和報警輸出 |
| 文件頁數(shù)： | 30/54頁 |
| 文件大小： | 378K |
| 代理商： | MSM6542-01 |
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Semiconductor
MSM6542-01/02/03
97
USAGE
Pattern layout
The oscillation stage of the 32.768 kHz oscillator circuit is at a high impedance to achieve very
low power dissipation. In addition, since sine waves are produced at as low as 32.768 kHz,
oscillation waves stay near the threshold for a longer time. For this reason, countermeasures
must be taken against power supply noise and external noise from the viewpoint of an analog
IC.
Countermeasures against power supply noise
Insert a 4.7
μ
F tantalum capacitor and 0.01
μ
F ceramic capacitor as close to the IC as possible.
When another IC (for example, backup RAM) is used in the battery-backed circuit, also insert
a by pass capacitor in that IC.
Countermeasures against external noise
Place the crystal for the oscillator circuit and the capacitors as close to the IC as possible. Do not
route other signal lines in the oscillator circuit regardless of whether the oscillator circuit is
placed on the front or back of the PC board.
Sufficiently separate the XT and
XT
signal lines from the other signal lines regardless of whether
these signal lines are running on the fron or back of the PC board (see a.. and b.. of the figure
below).
For the MSM6542-01/02
For the MSM6542-03
V
DD
XT
XT
a
b
2
1
1
≥
7.5 mm
≥
5 mm
2
From V
SS
pin
Pass
capacitor
V
DD
XT
XT
a
b
2
1
1
≥
0.3 INCH
≥
0.2 INCH
2
From pin 12 (V
SS
)
NC
Enclose the V
DD
line oscillation
section
V
DD
XT
XT
a
b
2
1
From V
SS
pin
Bypass
capacitor
V
DD
XT
XT
a
b
2
1
From pin 12 (V
SS
)
NC
Bypass
capacitor
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MSM6542-02 | REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT |
| MSM6542-03 | REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT |
| MSM6545 | Operatable at 0.9 V and Built-in Buzzer Circuit 4-Bit Microcontroller |
| MSM6545L | Operatable at 0.9 V and Built-in Buzzer Circuit 4-Bit Microcontroller |
| MSM6545L-XXGS-2K | Operatable at 0.9 V and Built-in Buzzer Circuit 4-Bit Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MSM6542-02 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT |
| MSM6542-02RS | 制造商:ROHM Semiconductor 功能描述: |
| MSM6542-03 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT |
| MSM6544 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:42-DOT LCD DRIVER |
| MSM6544GS-2KR1 | 制造商:ROHM Semiconductor 功能描述: |
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