MAX3045BEUE-T View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX3045BEUE-T

±10kV ESD-Protected, Quad 5V RS-485/RS-422 Transmitters

Maxim Integrated 

±10kV ESD-Protected, Quad 5V RS-485/RS-422

Transmitters

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. Of course, 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.

±4kV Electrical Fast Transient/Burst Testing

(IEC 1000-4-4)

IEC 1000-4-4 Electrical Fast Transient/Burst (EFT/B) is

an immunity test for the evaluation of electrical and

electronic systems during operating conditions. The

test was adapted for evaluation of integrated circuits

with power applied. Repetitive fast transients with

severe pulsed EMI were applied to signal and control

ports. Over 15,000 distinct discharges per minute are

sent to each interface port of the IC or equipment under

test (EUT) simultaneously with a minimum test duration

time of one minute. This simulates stress due to dis-

placement current from electrical transients on AC

mains, or other telecommunication lines in close prox-

imity. Short rise times and very specific repetition rates

are essential to the validity of the test.

Stress placed on the EUT is severe. In addition to the

controlled individual discharges placed on the EUT,

extraneous noise and ringing on the transmission line

can multiply the number of discharges as well as

increase the magnitude of each discharge. All cabling

was left unterminated to simulate worst-case reflections.

The MAX3040–MAX3045 were setup as specified in

IEC 1000-4-4 and the Typical Operating Circuit of this

data sheet. The amplitude, pulse rise time, pulse dura-

tion, pulse repetition period, burst duration, and burst

period (Figure 8) of the burst generator were all verified

with a digital oscilloscope according to the specifica-

tions in IEC 1000-4-4 sections 6.1.1 and 6.1.2. A simpli-

fied diagram of the EFT/B generator is shown in Figure

7. The burst stresses were applied to Y1–Y4 and Z1–Z4

simultaneously.

IEC 1000-4-4 provides several levels of test severity

(see Table 1). The MAX3040–MAX3045 pass the 4000V

stress, a special category “X” beyond the highest level

for severe (transient) industrial environments for

telecommunication lines.

RC

1MΩ

CHARGE-CURRENT

LIMIT RESISTOR

HIGH-

VOLTAGE

DC

SOURCE

Cs

100pF

RD

1.5kΩ

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

Figure 6a. 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 6b. Human Body Model Current Waveform

Table 1. Test Severity Levels for

Communication Lines

ON I/O,

SIGNAL, DATA

EFT

AND CONTROL

LEVEL

PORTS

PEAK

REPETITION

VOLTAGE RATE (kHz)

INDUSTRIAL

ELECTRO-

MAGNETIC

ENVIROMENT

1

250

5

Well protected

2

500

5

Protected

3

1000

5

4

2000

5

Typical

Severe

X

4000

5

MAX3040–MAX3045

8 _______________________________________________________________________________________

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