SP3220ECT datasheet(14/18 Pages) SIPEX

14 / 18 page

11/07/02

SP3220E True +3.0 to +5.0V RS-232 Transceivers

Figure 16. 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 1.5kΩ an 100pF, respectively. For

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

and the source capacitor (C

S) are 330Ω an 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 injects a higher voltage to the test

point when SW2 is switched on. The lower

current limiting resistor increases the current

charge onto the test point.

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