MAX3244EEAI datasheet(13/21 Pages) MAXIM

13 / 21 page

±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V,

RS-232 Transceivers with AutoShutdown Plus

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, whereas competing RS-232 products can

latch and must be powered down to remove latchup.

ESD protection can be tested in various ways; the

transmitter outputs and receiver inputs of this product

family are characterized for protection to the following

limits:

1) ±15kV using the Human Body Model

2) ±8kV using the Contact-Discharge Method specified

in IEC 1000-4-2

3) ±15kV using IEC 1000-4-2’s Air-Gap Method.

ESD Test Conditions

ESD performance depends on a variety of conditions.

Contact Maxim for a reliability report that documents

test setup, test methodology, and test results.

Human Body Model

Figure 6a shows the Human Body Model and Figure 6b

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 test device

through a 1.5k

Ω resistor.

IP 100%

90%

36.8%

tRL

TIME

tDL

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

10%

AMPERES

Figure 6b. Human Body Current Waveform

tr = 0.7ns to 1ns

30ns

60ns

100%

90%

10%

Figure 7b. IEC 1000-4-2 ESD Generator Current Waveform

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

100pF

RC 1M

RD 1500

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

Figure 6a. Human Body ESD Test Model

Figure 7a. IEC 1000-4-2 ESD Test Model

CHARGE CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

150pF

RC 50M

Ω to 100MΩ

RD 330

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

Maxim Integrated

MAX3224E/MAX3225E/

MAX3226E/MAX3227E/MAX3244E/MAX3245E

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