Rainbow-electronics MAX13237E Manual do Utilizador descarregar pdf (Página 12)

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with

Low-Voltage Interface

12 ______________________________________________________________________________________

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

100pF

1MΩ

1500Ω

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

Figure 8a. Human Body ESD Test Model

100%

90%

36.8%

TIME

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

10%

AMPERES

Figure 8b. Human Body Current Waveform

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

150pF

50MΩ to 100MΩ

330Ω

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

Figure 9a. IEC61000-4-2 ESD Test Model

= 0.7ns to 1ns

30ns

60ns

100%

90%

10%

PEAK

Figure 9b. IEC61000-4-2 ESD Generator Current Waveform

±15kV ESD Protection

ESD-protection structures are incorporated on all pins

to protect against electrostatic discharges encountered

during handling and assembly. The driver outputs and

receiver inputs of the MAX13234E–MAX13237E have

extra protection against static electricity. Maxim’s engi-

neers have developed state-of-the-art structures to pro-

tect these pins against ESD of ±15kV without damage.

The ESD structures withstand high ESD in all states:

normal operation, shutdown, and powered down. After

an ESD event, Maxim’s E versions keep working without

latchup. ESD protection can be tested in various ways;

the transmitter outputs and receiver inputs of this prod-

uct family are characterized for protection to the follow-

ing limits:

1) ±15V Using the Human Body Model

2) ±15kV Using IEC 61000-4-2 Air-Gap Method

3) ±8kV Using IEC 61000-4-2 Contact-Discharge

Method

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