MAX3224ECTP View Datasheet(PDF) - Maxim Integrated

Part Name

Description

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MAX3224ECTP

±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus

Maxim Integrated 

MAX3224E/MAX3225E/

MAX3226E/MAX3227E/MAX3244E/MAX3245E

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

RS-232 Transceivers with AutoShutdown Plus

RC 1MΩ

CHARGE-CURRENT

LIMIT RESISTOR

HIGH-

VOLTAGE

DC

SOURCE

Cs

100pF

RD 1500Ω

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

RC 50MΩ to 100MΩ RD 330Ω

CHARGE CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

HIGH-

VOLTAGE

DC

SOURCE

Cs

150pF

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

Figure 6a. Human Body ESD Test Model

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

IP 100%

90%

AMPERES

36.8%

10%

0

0 tRL

Ir

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

TIME

tDL

CURRENT WAVEFORM

Figure 6b. Human Body Current Waveform

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.

I

100%

90%

10%

tr = 0.7ns to 1ns

t

30ns

60ns

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

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 1.5kΩ resistor.

Maxim Integrated

13

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