SP3222EB datasheet(14/25 Pages) SIPEX

14 / 25 page

Date:11/02/05

SP3222EB/SP3232EB True +3.0V to +5.5V RS-232 Transceivers

Date:02/27/05

SP3222EB/3232EB True +3.0 to +5.5V RS-232 Transceivers

Figure 20. ESD Test Waveform for IEC1000-4-2

30A

15A

t=30ns

t ➙

t=0ns

Device Pin

Human Body

IEC1000-4-2

Tested

Model

Air Discharge Direct Contact

Level

Driver Outputs

15kV

8kV

Receiver Inputs

15kV

8kV

Table 3. Transceiver ESD Tolerance Levels

For the Human Body Model, the current

limiting resistor (R

S) and the source capacitor

S) are 1.5k

an 100pF, respectively. For

IEC-1000-4-2, the current limiting resistor (R

and the source capacitor (C

S) are 330

150pF, respectively.

The higher C

S value and lower RS value in the

IEC1000-4-2 model are more stringent than the

Human Body Model. The larger storage capacitor

injectsahighervoltagetothetestpointwhenSW2

is switched on. The lower current limiting resistor

increases the current charge onto the test point.

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