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LMS202ECMX Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LMS202ECMX
Descripción Electrónicos  15KV ESD Rated, 5V Single Supply TIA/EIA-232 Dual Transceivers
Download  8 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMS202ECMX Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Application Information (Continued)
MACHINE MODEL
The Machine Model is the standard ESD test method in
Japan and the automotive industry. It simulates a charge on
large object discharging through the IC device. This takes
place in automated test and handling systems. The equip-
ment can accumulate static charge due to improper ground-
ing, which is transmitted through the IC when it is picked and
placed.
The waveform is obtained by discharging 400V volts capaci-
tor to the device. Resistor, R2 = 0
Ω.
The parasitic inductance, L, from the PCB affects the peak
current and period of the waveform. For L = 0.5µF, the peak
current is approximately 7A with a period of 60 ns. For L =
2.5µH, the peak current is reduced to 4A with a period of 140
ns.
IEC 1000-4-2 (EN61000-4-2)
The European Union requires ESD immunity testing for all
electronic products as a condition for EMC Mark before
shipping to any member countries. This is not a IC require-
ment but an overall system requirement. IEC 1000-4-2
specifies ESD testing both by contact and air-gap discharge.
ESD testing by contact are generally more repeatable than
air-gap but is less realistic to actual ESD event. However,
air-gap discharge is more realistic but ESD results may vary
widely dependent on environmental conditions (temperature,
humidity,....) The waveform is obtained by discharging
150pF capacitor through a resistor, R2 = 330
Ω. A typical
peak current may be high as 37A with 10kV.
20048004
FIGURE 3. MM ESD Model
20048007
FIGURE 4. MM Waveform
20048004
FIGURE 5. IEC ESD Model
20048009
FIGURE 6. IEC Waveform
www.national.com
6


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