MAX232ECSLASHD datasheet(12/26 Pages) AD

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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 equip-

ment that meets level 4 (the highest level) of IEC1000-

4-2, without the need for additional ESD-protection

components.

The major difference between tests done using the

Human Body Model and IEC1000-4-2 is higher peak cur-

rent in IEC1000-4-2, because series resistance is lower

in the IEC1000-4-2 model. Hence, the ESD withstand

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 connects

the probe to the device before the probe is energized.

Machine Model

The Machine Model for ESD tests all pins using a 200pF

storage capacitor and zero discharge resistance. Its

objective is to emulate the stress caused by contact that

occurs with handling and assembly during manufacturing.

Of course, all pins require this protection during manu-

facturing, not just RS-232 inputs and outputs. Therefore,

after PC board assembly, the Machine Model is less rel-

evant to I/O ports.

Figure 6a. Human Body ESD Test Model

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

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

Figure 6b. Human Body Model Current Waveform

www.analog.com

Analog Devices │ 12

MAX202E–MAX213E,

MAX232E/MAX241E

±15kV ESD-Protected,

5V RS-232 Transceivers

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

100pF

RC 1MΩ

RD 1500Ω

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

150pF

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

RC 50MΩ to 100MΩ

RD 330Ω

tr = 0.7ns to 1ns

30ns

60ns

100%

90%

10%

IP100%

90%

36.8%

tRL

TIME

tDL

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

10%

AMPERES

MAX232EC/D Datasheet(PDF) 12 Page - Analog Devices

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