SP3222EEY/TR Exar, SP3222EEY/TR Datasheet - Page 13

• Manufacturer Part Number: SP3222EEY/TR
• Description: RS-232 Interface IC RS232 Transceiver 3-5.5V 2-drvr/2-rcvr
• Manufacturer: Exar

Specifications of SP3222EEY/TR

• Product Category: RS-232 Interface IC
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-20
• Function: Transceiver
• Number Of I/os: 4

Figure 17. ESD Test Circuit for IEC61000-4-2
equipment from a person already holding
the equipment. The current is transferred
on to the keypad or the serial port of the
equipment directly and then travels through
the PCB and finally to the IC.
The circuit models in Figures 16 and 17 rep-
resent the typical ESD testing circuit used for
all three methods. The C
with the DC 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
the current limiting resistor, onto the 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
(C
IEC-61000-4-2, the current limiting resistor
(R
an 150pF, respectively
Table 3. Transceiver ESD Tolerance Levels
Driver Outputs
Receiver Inputs
S
S
DEVICE PIN
) are 1.5kΩ an 100pF, respectively. For
) and the source capacitor (C
TESTED
DC Power
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
Source
S
) and the source capacitor
HUMAN BODY
.
R
S
MODEL
C
+15kV
+15kV
is initially charged
S
) are 330Ω
SW1
Air Discharge
S
,
13
+15kV
+15kV
C
S
The higher C
the IEC61000-4-2 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.
Figure 18. ESD Test Waveform for IEC61000-4-2
R S and R V add up to 330Ω for IEC61000-4-2.
R
30A
15A
S
0A
Contact-Discharge Model
t = 0ns
Direct Contact
R
IEC61000-4-2
V
S
value and lower R
+8kV
+8kV
SW2
t →
SP3222E/SP3232E_101_031413
t = 30ns
DESCRIPTION
Device
Under
Test
Level
S
4
4
value in