μPC451, μPC324

R03DS0142EJ0100 Rev.1.00

Page 8 of 10

2019.1.17

PRECAUTIONS

 The process of unused circuits

If there is an unused circuit, the following connection is recommended.

Process example of unused circuits

Remark: A midpoint potential of V+ and V− is applied to this example.

 Ratings of input/output pin voltage

When the voltage of input/output pin exceeds the absolute maximum rating, it may cause degradation of

characteristics or damage, by a conduction of a parasitic diode within an IC. In addition, if the input pin is

lower than V−, or the output pin exceeds the power supply voltage, it is recommended to make a clamp

circuit using a diode with low forward voltage (e.g.: Schottky diode) as protection.

 Range of common-mode input voltage

When the supply voltage does not meet the condition of electrical characteristics, the range of common-

mode input voltage is as follows.

VICM (TYP.): V− to V+ − 1.5 (V) (TA = 25°C).

During designing, do include some tolerance by considering temperature characteristics and etc.

 Maximum output voltage

The TYP. value range of the maximum output voltage when the supply voltage does not meet the condition

of electrical characteristics is as follows:

Vom+ (TYP.): V+ − 1.5 (V) (TA = 25°C), Vom− (TYP.) (IO SINK ≤ 50 μA): Approx. V− (V) (TA = 25°C).

During designing, include some tolerance such as characteristics variation and temperature characteristics

consideration and so forth. In addition, also note that the output voltage range (Vom+ − Vom−) will become

narrow when an output current increases.

 Operation of output

This IC output level consist of a class C push-pull. Therefore, when a load resistance is connected to the

midpoint potential of V+ , V− , a crossover distortion occurs during the transition state of output current flow

direction (source, sink).

 Handling of ICs

When stress is added to the ICs due to warpage or bending of a board, the characteristic may fluctuates

due to piezoelectric effect. Therefore, pay attention to warpage or bending of a board.

To potentials within the

range of common-mode

input voltage (VICM)