SP207EEA-L Exar Corporation, SP207EEA-L Datasheet - Page 11

• Manufacturer Part Number: SP207EEA-L
• Description: IC TXRX RS232 ESD LP 24SSOP
• Manufacturer: Exar Corporation
• Type: Transceiverr

Specifications of SP207EEA-L

• Package / Case: 24-SSOP (0.200", 5.30mm Width)
• Number Of Drivers/receivers: 5/3
• Protocol: RS232
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• On Resistance (max): 7 KOhms
• Propagation Delay Time: 1.5 us
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Function: Transceiver
• Mounting Style: SMD/SMT
• Supply Current: 3 mA
• Supply Voltage (max): 6 V
• Supply Voltage (min): 5 V
• Logic Type: RS-232 Transceivers
• Number Of Circuits: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

The Contact Discharge Method applies the
ESD current directly to the EUT. This method
was devised to reduce the unpredictability
of the ESD arc. The discharge current rise
time is constant since the energy is directly
transferred without the air-gap arc.
In situations such as hand held systems, the
ESD charge can be directly discharged to
the 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 model in Figures 7 and 8 represent
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 sec-
ond switch (SW2) is on while SW1 switches
off. The voltage stored in the capacitor is
then applied through R
resistor, onto the device under test (DUT).
In ESD tests, the SW2 switch is pulsed so
that the device under test receives a dura-
tion of voltage.
For the Human Body Model, the current
limiting resistor (R
DC Power
Source
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
R
S
C
) and the source capacitor
S
S
, the current limiting
is initially charged
SW1
Figure 8. ESD Test Circuit for IEC000-4-2
C

S
R S and R V add up to 330Ω for IEC1000-4-2.
(C
IEC-000-4-2, the current limiting resistor
(R
an 50pF, respectively.
The higher C
the IEC000-4-2 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.
5A
30A
0A
R
S
S
Figure 9. ESD Test Waveform for IEC1000-4-2
S
) are 1.5kΩ an 100pF, respectively. For
) and the source capacitor (C
t=0ns
Contact-Discharge Model
R
V
S
value and lower R
t
SW2
SP207E_00_072309
t=30ns
S
) are 330Ω
Device
Under
Test
S
value in