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 C
1
and C
2
for the low frequency and for the high frequency between the power supply line
and the GND line as shown in following figure 5.
V
CC
+
C
1
C
2
R
1
Input
Vin
R
2
GND
Power-supply
M51957
M51958
Output
Example of ripple
noise measures
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 < V
CC
– 0.3 (V) .... at V
CC
≤
7 V
about 0.8 (V) < Vin < 6.7 (V) .............. at V
CC
> 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).
V
CC
Vin is decided to the V
CC
subordinating,
Power-supply and operates in the range
about 0.8 (V) < Vin < V
CC
– 0.3 (V).
Output
M51957
M51958
Delay capacitor
Cd
Input
Vin
GND
Figure 6 Recommended Example
REJ03D0778-0200 Rev.2.00 Aug 20, 2007
Page 8 of 13
RENESAS [ RENESAS TECHNOLOGY CORP ]
