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M51957B Datasheet(PDF) 8 Page - Renesas Technology Corp

Part # M51957B
Description  Voltage Detecting, System Resetting IC Series
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M51957B Datasheet(HTML) 8 Page - Renesas Technology Corp

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M51957A,B/M51958A,B
REJ03D0778-0200 Rev.2.00 Aug 20, 2007
Page 8 of 13
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.
Power-supply
Output
R1
VCC
R2
Vin
M51957
M51958
Input
GND
C2
C1
+
Delay capacitor
Cd
Example of ripple
noise measures
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).
Power-supply
Output
Vin
M51957
M51958
Input
GND
VCC
Delay capacitor
Cd
Vin is decided to the VCC subordinating,
and operates in the range
about 0.8 (V) < Vin < VCC – 0.3 (V).
Figure 6 Recommended Example


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