MAX3097ECSE データシートの表示（PDF） - Maxim Integrated

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MAX3097ECSE

±15kV ESD-Protected, 32Mbps, 3V/5V, Triple RS-422/RS-485 Receivers with Fault Detection

Maxim Integrated 

±15kV ESD-Protected, 32Mbps, 3V/5V,

Triple RS-422/RS-485 Receivers with Fault Detection

±15kV ESD Protection

As with all Maxim devices, ESD-protection structures

are incorporated on all pins to protect against ESD

encountered during handling and assembly. The

MAX3097E/MAX3098E receiver inputs have extra pro-

tection against static electricity found in normal opera-

tion. Maxim’s engineers developed state-of-the-art

structures to protect these pins against ±15kV ESD

without damage. After an ESD event, the MAX3097E/

MAX3098E continue working without latchup.

ESD protection can be tested in several ways. The

receiver inputs are characterized for protection to the

following:

• ±15kV using the Human Body Model

• ±8kV using the Contact Discharge method specified

in IEC 1000-4-2 (formerly IEC 801-2)

• 15kV using the Air-Gap Discharge method specified

in IEC 1000-4-2 (formerly IEC 801-2)

ESD Test Conditions

ESD performance depends on a number of conditions.

Contact Maxim for a reliability report that documents

test setup, methodology, and results.

Human Body Model

Figure 5a shows the Human Body Model, and Figure

5b shows the current waveform it generates when dis-

charged into a low impedance. This model consists of

a 100pF capacitor charged to the ESD voltage of inter-

est, which is then discharged into the device through a

1.5kΩ resistor.

IEC 1000-4-2

Since January 1996, all equipment manufactured and/or

sold in the European community has been required to

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

1000-4-2 standard covers ESD testing and performance

of finished equipment; it does not specifically refer to inte-

grated circuits. The MAX3097E/MAX3098E help you

design equipment that meets Level 4 (the highest level)

of IEC 1000-4-2, without additional ESD-protection com-

ponents.

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 6a), the

ESD-withstand voltage measured to this standard is gen-

erally lower than that measured using the Human Body

Model. Figure 6b 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

charge probe. The Contact Discharge method connects

the probe to the device before the probe is energized.

Machine Model

The Machine Model for ESD testing uses a 200pF stor-

age capacitor and zero-discharge resistance. It mimics

the stress caused by handling during manufacturing

and assembly. All pins (not just RS-485 inputs) require

this protection during manufacturing. Therefore, the

Machine Model is less relevant to the I/O ports than are

the Human Body Model and IEC 1000-4-2.

RC

1MΩ

CHARGE-CURRENT

LIMIT RESISTOR

HIGH-

VOLTAGE

DC

SOURCE

Cs

100pF

RD

1.5k

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

Figure 5a. Human Body ESD Test Model

IP 100%

90%

Ir

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

AMPERES

36.8%

10%

0

0 tRL

TIME

tDL

CURRENT WAVEFORM

Figure 5b. Human Body Model Current Waveform

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