UPC1251, UPC358

R03DS0144EJ0200 Rev.2.00

Page 8 of 11

Feb.18.25

USE WITH PRECAUTIONS

• The process of unused circuits

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

• 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 damages, by a conduction of a parasitic diode within an IC. In addition, when the input pin may be

lower than V−, or the output pin may exceed the power supply voltage, it is recommended to make a clump circuit by

a diode whose forward voltage is low (e.g.: Schottky diode) for 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 range of the TYP. value 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 at 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.

Process example of unused circuits

To potentials within

the range of

common-mode input

voltage (VICM)

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