m51945a Renesas Electronics Corporation., m51945a Datasheet - Page 6

• Manufacturer Part Number: m51945a
• Description: Voltage Detecting, System Resetting Ic Series
• Manufacturer: Renesas Electronics Corporation.

M51945A,B/M51946A,B
Notice for use
About the Power Supply Line
1. About bypass capacitor
2. The sequence of voltage impression
About the Input Terminal
1. Setting range of input voltage
2. About using input terminal
REJ03D0774-0300 Rev.3.00 Sep 18, 2007
Page 6 of 10
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 C
and the GND line as shown in following figure 2.
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.)
The following voltage is recommended to be input to the input terminal (pin 2).
Please do an enough verification to the transition characteristic etc. of the power supply when using independent
power supply to input terminal (pin 2).
about 0.8 (V) < Vin < V
about 0.8 (V) < Vin < 6.7 (V) .............. at V
V
CC
Vin
V
CC
1
Input
Example of ripple
noise measures
and C
C
CC
Figure 2 Example of Ripple Noise Measures
GND
1
+
– 0.3 (V) .... at V
2
for the low frequency and for the high frequency between the power supply line
C
Figure 3 Recommended Example
2
M51945
M51946
Power-supply
R
R
Vin
1
2
CC
CC
Output
≤ 7 V
> 7 V
Input
Vin is decided to the V
and operates in the range
about 0.8 (V) < Vin < V
GND
M51945
M51946
Power-supply
CC
CC
Output
subordinating,
– 0.3 (V).