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M51957A 参数 Datasheet PDF下载

M51957A图片预览
型号: M51957A
PDF下载: 下载PDF文件 查看货源
内容描述: 电压检测,设备重新启动IC系列 [Voltage Detecting, System Resetting IC Series]
分类和应用:
文件页数/大小: 14 页 / 179 K
品牌: RENESAS [ RENESAS TECHNOLOGY CORP ]
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M51957A,B/M51958A,B  
Notice for use  
About the Power Supply Line  
1. About bypass capacitor  
Because the ripple and the spike of the high frequency noise and the low frequency are superimposed to the power  
supply line, it is necessary to remove these.  
Therefore, please install C1 and C2 for the low frequency and for the high frequency between the power supply line  
and the GND line as shown in following figure 5.  
VCC  
+
C1  
C2  
Power-supply  
R1  
Input  
Output  
Example of ripple  
noise measures  
M51957  
M51958  
Vin  
R2  
GND  
Delay capacitor  
Cd  
Figure 5 Example of Ripple Noise Measures  
2. The sequence of voltage impression  
Please do not impress the voltages to the input terminals earlier than the power supply terminal. Moreover, please  
do not open the power supply terminal with the voltage impressed to the input terminal.  
(The setting of the bias of an internal circuit collapses, and a parasitic element might operate.)  
About the Input Terminal  
1. Setting range of input voltage  
The following voltage is recommended to be input to the input terminal (pin 2).  
about 0.8 (V) < Vin < VCC – 0.3 (V) .... at VCC 7 V  
about 0.8 (V) < Vin < 6.7 (V) .............. at VCC > 7 V  
2. About using input terminal  
Please do an enough verification to the transition characteristic etc. of the power supply when using independent  
power supply to input terminal (pin 2).  
VCC  
Vin is decided to the VCC subordinating,  
and operates in the range  
about 0.8 (V) < Vin < VCC – 0.3 (V).  
Power-supply  
Input  
Output  
M51957  
M51958  
Vin  
GND  
Delay capacitor  
Cd  
Figure 6 Recommended Example  
REJ03D0778-0200 Rev.2.00 Aug 20, 2007  
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