MAX3421E(2006) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX3421E
(Rev.:2006)

USB Peripheral/Host Controller with SPI Interface

Maxim Integrated 

USB Peripheral/Host Controller

with SPI Interface

5V SWITCH WITH

OUT

CURRENT LIMIT

IN

AND OC DETECT

ON FLAG

4.7µF

VBUS

33Ω

D+

USB

"A" CONNECTOR

33Ω

D-

GND

1.0µF

CERAMIC

GPOUT GPIN

D+

D-

VBCOMP

GND

RES

MAX3421E

VCC VL

SCLK

MOSI

SS

MISO

INT

GPX

XI

CXI

XO

CXO

12MHz

5V

3.3V

REGULATOR

WITH POR

0.1µF

VCC

µP

INT1

INT2

GND

Figure 21. MAX3421E in a Host Application

eight GPOUT pins turns the VBUS switch on and off.

Seven MAX3421E GPIN and GPOUT pins are available

to the system.

Short-Circuit Protection

The MAX3421E withstands VBUS shorts to D+ and D-

on the USB connector side of the 33Ω series resistors.

ESD Protection

D+, D-, and VBCOMP possess extra protection against

static electricity to protect the devices up to ±15kV. The

ESD structures withstand high ESD in all operating

modes: normal operation, suspend mode, and pow-

ered down. VBCOMP and VCC require 1µF ceramic

capacitors connected to ground as close to the pins as

possible. D+, D-, and VBCOMP provide protection to

the following limits:

• ±15kV using the Human Body Model

• ±8kV using the Contact Discharge method specified

in IEC 61000-4-2

• ±12kV using the IEC 61000-4-2 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 22 shows the Human Body Model, and Figure 23

shows the current waveform generated when dis-

charged into a low impedance. This model consists of

a 100pF capacitor charged to the ESD voltage of inter-

est, which then discharges into the test device through

a 1.5kΩ resistor.

IEC 61000-4-2

The IEC 61000-4-2 standard covers ESD testing and

performance of finished equipment. It does not specifi-

cally refer to integrated circuits. The major difference

between tests done using the Human Body Model and

IEC 61000-4-2 is a higher peak current in IEC 61000-4-

2, due to lower series resistance. Hence, the ESD with-

stand voltage measured to IEC 61000-4-2 generally is

lower than that measured using the Human Body

26 ______________________________________________________________________________________

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