SP3243ECA-L Exar Corporation, SP3243ECA-L Datasheet - Page 17

• Manufacturer Part Number: SP3243ECA-L
• Description: IC TXRX RS232 INTELLIGENT 28SSOP
• Manufacturer: Exar Corporation
• Type: Transceiverr

Specifications of SP3243ECA-L

• Package / Case: 28-SSOP (0.200", 5.30mm Width)
• Number Of Drivers/receivers: 3/5
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 0.3 mA
• Operating Temperature Range: 0 C to + 70 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 1016-1120-5

Date: 2/05/06
Figure 31. ESD Test Circuit for IEC1000-4-2
The circuit models in Figures30 and 31 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
, the current limiting resistor, onto the
S
) 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 R
HUMAN BODY
C
C C
MODEL
+15kV
+15kV
S
) and the source
SW1
SW1
SW1
S
SP3243 +3.0V to +5.5V RS-232 Transceivers
value in the
S
) are
Air Discharge
C
C C
17
S
S S
+15kV
+15kV
R S and R V add up to 330Ω for IEC1000-4-2.
R R S S and
Figure 32. ESD Test Waveform for IEC1000-4-2
15A
30A
R
R R
0A
and R R V V add up to 330
S
S S
Contact-Discharge Module
Contact-Discharge Module
Contact-Discharge Module
add up to 330Ω Ω f for IEC1000-4-2.
t=0ns
R
R R
V
V V
Direct Contact
IEC1000-4-2
+8kV
+8kV
or IEC1000-4-2.
SW2
SW2
SW2
t ➙
© Copyright 2006 Sipex Corporation
Device
Under
Test
t=30ns
Level
4
4