88CXX

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

8

www.unisonic.com.tw

QW-R502-040,A

V

td

OUT

Figure 3

5. Through-type current

Through-type current refers to the current which flows instantaneously, at the time of detection and release of a

voltage detector. Through-type current is large in CMOS output devices.

6. Oscillation

In applications where a resistor is connected to the voltage detector input , in the CMOS active low products for

example, the through-type current generated when the output goes from low to high (release) causes a voltage

drop equal to [through-type current]×[input resistance] across the resistor. When the resultant input voltage drops

and its resultant voltage drop have disappeared, and the output goes back from low to high. A through-type current

is again generated, a voltage drop appears, and the process repeats. This unstable condition is referred to as

oscillation.

STANDARD CIRCUIT

Vss

OUT

Figure 5