Overvoltage Protection Controllers

with Reverse Polarity Protection

_______________________________________________________________________________________

9

IEC 1000-4-2

Since January 1996, all equipment manufactured

and/or sold in the European Union has been required to

meet the stringent IEC 1000-4-2 specification. The IEC

1000-4-2 standard covers ESD testing and perfor-

mance of finished equipment. It does not specifically

refer to ICs. The MAX4864L/MAX4865L/MAX4866L/

MAX4867 help users design equipment that meets

Level 3 of IEC 1000-4-2, without additional ESD-protec-

tion components.

The main difference between tests done using the

Human Body Model and IEC 1000-4-2 is higher peak

current in IEC 1000-4-2. Because series resistance is

lower in the IEC 1000-4-2 ESD test model (Figure 9), the

ESD-withstand voltage measured to this standard is gen-

erally lower than that measured using the Human Body

Model. Figure 10 shows the current waveform for the

±8kV IEC 1000-4-2 Level 4 ESD Contact Discharge test.

The Air-Gap test involves approaching the device with a

charger probe. The Contact Discharge method connects

the probe to the device before the probe is energized.

Chip Information

PROCESS: BiCMOS

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

Cs

100pF

1M

Ω

1.5k

Ω

HIGH-

VOLTAGE

DC

SOURCE

DEVICE

UNDER

TEST

Figure 7. Human Body ESD Test Model

90%

36.8%

TIME

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

Ir

10%

0

0

AMPERES

Figure 8. Human Body Current Waveform

30ns

60ns

t

100%

90%

10%

I

Figure 10. IEC 1000-4-2 ESD Generator Current Waveform

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

Cs

150pF

50M

Ω TO 100MΩ

330

Ω

HIGH-

VOLTAGE

DC

SOURCE

DEVICE

UNDER

TEST

Figure 9. IEC 1000-4-2 ESD Test Model