MAX3380E View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX3380E

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins

Maxim Integrated 

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers

with ±15kV ESD-Protected I/O and Logic Pins

RC

1MΩ

CHARGE-CURRENT

LIMIT RESISTOR

RD

1500Ω

DISCHARGE

RESISTANCE

HIGH-

VOLTAGE

DC

SOURCE

Cs

100pF

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

RC

50MΩ to 100MΩ

CHARGE-CURRENT

LIMIT RESISTOR

RD

330Ω

DISCHARGE

RESISTANCE

HIGH-

VOLTAGE

DC

SOURCE

Cs

150pF

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 Current Waveform

the host logic supply (+1.65V to +5.5V). The VL input

will draw a maximum current of 20µA with receiver out-

puts unloaded.

±15kV ESD Protection

Maxim has developed state-of-the-art structures to pro-

tect these pins against an ESD of ±15kV without dam-

age. The ESD structures withstand high ESD in all states:

normal operation, shutdown, and power-down. After an

ESD event, Maxim’s “E” version devices keep working

without latch-up, whereas competing RS-232 products

can latch and must be powered down to remove latch-

up. ESD protection can be tested in various ways. The

transmitter and receiver outputs and receiver and logic

inputs of this product family are characterized for protec-

tion to the following limits:

• ±15kV using the Human Body Model

• ±8kV using the Contact Discharge method speci-

fied in IEC 1000-4-2

• ±15kV using IEC 1000-4-2’s Air-Gap Discharge

method

Figure 6a. IEC 1000-4-2 ESD Test Model

I

100%

90%

10%

tr = 0.7ns to 1ns

30ns

t

60ns

Figure 6b. 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, 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 test device

through a 1.5kΩ resistor.

IEC 1000-4-2

The IEC 1000-4-2 standard covers ESD testing and

performance of finished equipment; it does not specifi-

cally refer to ICs. The MAX3380E/MAX3381E help you

design equipment that meets Level 4, the highest level

of IEC 1000-4-2 without the need for additional ESD-

protection components. The major 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

model. Hence, the ESD withstand voltages measured

10 ______________________________________________________________________________________

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