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M51945A Datasheet(PDF) 6 Page - Renesas Technology Corp |
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M51945A Datasheet(HTML) 6 Page - Renesas Technology Corp |
6 / 11 page M51945A,B/M51946A,B REJ03D0774-0200 Rev.2.00 Aug 20, 2007 Page 6 of 10 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 2. Power-supply Output R1 VCC R2 Vin M51945 M51946 Input GND C2 C1 + Example of ripple noise measures Figure 2 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 M51945 M51946 Input GND Vin is decided to the VCC subordinating, and operates in the range about 0.8 (V) < Vin < VCC – 0.3 (V). VCC Figure 3 Recommended Example |
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