MAX202ECSE+T

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MAX202E–MAX213E,
MAX232E/MAX241E

±15kV ESD-Protected, 

5V RS-232 Transceivers 

est, which is then discharged into the test device
through a 1.5kΩ resistor.

IEC1000-4-2

The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The
MAX202E/MAX203E–MAX213E, MAX232E/MAX241E
help you design equipment that meets level 4 (the high-
est level) of IEC1000-4-2, without the need for addition-
al ESD-protection components.

The major difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2, because series resistance is
lower in the IEC1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC1000-4-2 is generally
lower than that measured using the Human Body

Model. Figure 7b shows the current waveform for the
8kV IEC1000-4-2 level-four ESD contact-discharge test.

The air-gap test involves approaching the device with a
charged probe. The contact-discharge method con-
nects the probe to the device before the probe is ener-
gized.

Machine Model

The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing. Of course, all pins require this protec-
tion during manufacturing, not just RS-232 inputs and

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

Cs

150pF

R

C

 50M

Ω to 100MΩ

R

D

 330

Ω

HIGH- 

VOLTAGE

DC

SOURCE

DEVICE

UNDER

TEST

Figure 7a.  IEC1000-4-2 ESD Test Model

tr = 0.7ns to 1ns

30ns

60ns

t

100%

90%

10%

I

PEAK

I

Figure 7b.  IEC1000-4-2 ESD Generator Current Waveform

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

Cs

100pF

R

C

 1M

Ω

R

D

 1500

Ω

HIGH-

VOLTAGE

DC

SOURCE

DEVICE

UNDER

TEST

Figure 6a.  Human Body ESD Test Model

I

P

 100%

90%

36.8%

t

RL

TIME

t

DL

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)

Ir

10%

0

0

AMPERES

Figure 6b.  Human Body Model Current Waveform

MAX202ECSE+T Information:
Part No.
MAX202ECSE+T

RFQ

Description
IC TXRX RS-232 W/CAP 16-SOIC
File Size
399670 bytes
Page Size
612 x 792 pts (letter)
All Pages
25
Manufacturer
Maxim Integrated
Homepage
http://www.maximintegrated.com/en.html
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