BU7233YF-C Datasheet, PDF (15/22 Pages) Rohm – Input Full Swing Open Drain Output Low Supply Current CMOS Comparators

BU7233YF-C
Datasheet
Operational Notes – continued
13. Unused Circuits
When there are unused comparators, it is recommended that they are
connected as in Figure 29, setting the non-inverting input pin to the VDD,
inverting input pin to the VSS.
VDD
14. Input Voltage
Applying VSS-0.3V to VDD+0.3V to the input pin is possible without
causing deterioration of the electrical characteristics or destruction,
regardless of the supply voltage. However, this does not ensure normal
circuit operation. Please note that the circuit operates normally only
when the input voltage is within the common mode input voltage range of
the electric characteristics.
VSS
Figure 29. Example of Application Circuit
for Unused Comparator
15. Power Supply(Single/Dual)
The voltage comparator operates when the voltage supplied is between VDD and VSS. Therefore, the single supply
voltage comparator can be used as dual supply voltage comparator as well.
16. Output Capacitor
If a large capacitor is connected between the output pin and VSS pin, current from the charged capacitor will flow into
the output pin and may destroy the IC when the VDD pin is shorted to ground or pulled down to 0V. Use a capacitor
smaller than 0.1µF between output pin and VSS pin.
17. Latch up
Be careful of input voltage that exceed the VDD and VSS. When CMOS device have sometimes occur latch up and
protect the IC from abnormaly noise.
18. Open Drain Output
Please connect and use a pull-up resistor to the output since this IC has an open-drain output.
19. Supply Voltage Start-up
When start up the supply voltage that the IC has output the applied VDD pin voltage until voltage reaches around 1V.
This function is not depending on input condition. This voltage has a possibility of the malfunction. Please give the
special consideration for startup order of supply voltage.
20. Ceramic Capacitor
When using a ceramic capacitor, determine the dielectric constant considering the change of capacitance with
temperature and the decrease in nominal capacitance due to DC bias and others.
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