UPC844, UPC4744

R03DS0137EJ0200 Rev.2.00

Page 7 of 10

Feb.14.25

USE WITH PRECAUTIONS

• Managing 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, the parasitic diode within the IC may conduct,

causing characteristics degradation or damage. 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 clamping 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−

~ V+ − 1.8 (V) (TA = 25°C).

During designing, do include some tolerance by considering temperature characteristics 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 [V] (TA = 25 °C), Vom - (TYP.) : V - +0.7 [V] (TA = 25 °C)

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

so on. In addition, also note that the output voltage range (Vom+ − Vom−) will become narrow when the output current

increases.

• Output Operation

This IC will not be able to sink output current when the output voltage is V− + 0.7 V and below. In this case, the output

voltage level can be improved to the V- side by connecting the load resistor between the output terminal and V- to sink

the current at the load resistor. (The effect will differ depending on the flow of current in the load resistance.)

• 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.

V -

+

-

V -

V +

V +

R

R

同相入力電圧範囲

(VICM) 内の電位へ

Process example of unused circuits

To potentials within

the range of

common-mode input

voltage (VICM)

Remark : In this example, an intermediate potential between V + and V - is applied.