88CXX-AF5-R(2005) Просмотр технического описания (PDF) - Unisonic Technologies

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производитель

88CXX-AF5-R
(Rev.:2005)

BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR

Unisonic Technologies 

88CXX

V

+VDET

VDD

OUT

CMOS IC

td

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

below the detection voltage -VDET, the output voltage returns to its low level. In this state, the through-type current

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

Connect directly the CD capacitor for delay between CD and Vss terminals

VDD

CD

OUT

Vss

Figure 5

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

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QW-R502-040,A

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