MAX3341E Просмотр технического описания (PDF) - Maxim Integrated

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MAX3341E

±15kV ESD-Protected USB Level Translator in UCSP with USB Detect

Maxim Integrated 

±15kV ESD-Protected USB Level Translator in

UCSP with USB Detect

MODE, SUSP, and OE low, and apply data to

VPO/VMO. When VMO is high, a single-ended zero con-

dition is sent on the bus and RCV is undefined (Table 1).

ESD Protection

To protect the MAX3341E against ESD, D+ and D-

have extra protection against static electricity to protect

the device up to ±15kV. The ESD structures withstand

high ESD in all states—normal operation, suspend, and

powered down. In order for the 15kV ESD structures to

work correctly, a 1µF or greater capacitor must be con-

nected from VTRM to GND.

ESD protection can be tested in various ways; the D+

and D- input/output pins are characterized for protection

to the following limits:

1) ±15kV using the Human Body Model

2) ±8kV using the IEC 1000-4-2 Contact Discharge

method

3) ±15kV using the IEC 1000-4-2 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 1a shows the Human Body Model, and Figure 1b

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 interest,

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 per-

formance of finished equipment; it does not specifically

refer to integrated circuits. The MAX3341E helps the user

design equipment that meets level 4 of IEC 1000-4-2, with-

out the need for additional ESD-protection components.

The major difference between tests done using the

Human Body Model and IEC 1000-4-2 is a higher peak

current in IEC 1000-4-2, because series resistance is

lower in the IEC 1000-4-2 model. Hence, the ESD with-

stand voltage measured to IEC 1000-4-2 is generally

lower than that measured using the Human Body Model.

Figure 1c shows the IEC 1000-4-2 model.

The Air-Gap Discharge test involves approaching the

device with a charged probe. The Contact Discharge

method connects the probe to the device before the

probe is energized.

RC

1MΩ

RD

1500Ω

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

HIGH-

VOLTAGE

DC

SOURCE

Cs

100pF

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

Figure 1a. Human Body ESD Test Models

IP 100%

90%

Ir

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

AMPERES

36.8%

10%

0

0 tRL

TIME

tDL

CURRENT WAVEFORM

Figure 1b. Human Body Model Current Waveform

RC

50MΩ TO 100MΩ

RD

330Ω

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

HIGH-

VOLTAGE

DC

SOURCE

Cs

150pF

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

Figure 1c. IEC 1000-4-2 ESD Test Model

Machine Model

The Machine Model for ESD tests all pins using a 200pF

storage capacitor and zero discharge resistance. Its

objective is to emulate the stress caused by contact that

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