88C28-AF5-R datasheet(10/16 Pages) UTC

10 / 16 page

88CXX

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

www.unisonic.com.tw

QW-R502-040,A

Cautions

*The open of CD terminal may cause double pulses shown in Figure 8 at release. If the double pulses cause a

trouble, attach 10pF or larger capacitor to the CD terminal. Do not apply the voltage to the CD terminal.

Time

Figure 8

*Layout the print circuit board not to apply or flow out the current to/from the CD terminal. Doing not so may cause

inaccurate delay time.

*Use an external capacitor, CD of which leakage current can be ignored for the built-in constant-current value. A

leakage current may cause an error of delay time. Also, a leakage current over the built-in constant-current

causes unrelease status.

3. Other characteristics

(1) Temperature characteristic of detection voltage.

The temperature characteristics of the detection voltage are expressed by the oblique line parts in Figure 9.

1.500

-40

-VDET (V)

+0.54mV/℃

-0.54mV/℃

Ta(℃)

Figure 9

(2) Temperature characteristics of release voltage

The temperature factor (

) of the release voltage is calculated by the temperature factor of the

detection voltage as follows:

∆ + V DET

∆ Ta

+ VDET

- VDET

∆ - V DET

∆ Ta

The temperature factor of the release voltage has a same sign characteristics as the temperature factor of the

detection voltage.

(3) Temperature characteristics of hysteresis voltage

The temperature characteristics of hysteresis voltage (

) is calculated as follows:

+VDEF

-VDEF

+VDEF

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