sp3223ebcy-tr Exar Corporation, sp3223ebcy-tr Datasheet - Page 17

• Manufacturer Part Number: sp3223ebcy-tr
• Description: Sp3223eb -intelligent +3.0v To +5.5v Rs-232 Transceivers
• Manufacturer: Exar Corporation

Date: 10/06/06
Figure 25. ESD Test Circuit for IEC1000-4-2
The circuit model in Figures 22 and 23 represent
the typical ESD testing circuit used for all three
methods. The C
power supply when the first switch (SW1) is on.
Now that the capacitor is charged, the second
switch (SW2) is on while SW1 switches off. The
voltage stored in the capacitor is then applied
through R
device under test (DUT). In ESD tests, the SW2
switch is pulsed so that the device under test
receives a duration of voltage.
For the Human Body Model, the current limiting
resistor (R
1.5kΩ an 100pF, respectively. For IEC-1000-4-
2, the current limiting resistor (R
capacitor (C
The higher C
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.
Table 4. Transceiver ESD Tolerance Levels
Driver Outputs
Receiver Inputs
DEVICE PIN
TESTED
S
DC Power
Source
S
, the current limiting resistor, onto the
) and the source capacitor (C
S
) are 330Ω an 150pF, respectively.
S
value and lower R
S
is initially charged with the DC
R
R
HUMAN BODY
C
C
MODEL
±15kV
±15kV
S
) and the source
SW1
SW1
S
value in the
SP3223 +3.0V to +5.5V RS-232 Transceivers
S
) are
Air Discharge
C
C
17
S
S
±15kV
±15kV
R S and R V add up to 330Ω for IEC1000-4-2.
R S and R V add up to 330Ω for IEC1000-4-2.
Figure 26. ESD Test Waveform for IEC1000-4-2
15A
30A
R
0A
R
S
S
Contact-Discharge Module
Contact-Discharge Module
t=0ns
R
R
V
V
Direct Contact
IEC1000-4-2
±8kV
±8kV
SW2
SW2
t
© Copyright 2006 Sipex Corporation
Device
Under
Test
t=30ns
Level
4
4