MAX14532E データシートの表示（PDF） - Maxim Integrated

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MAX14532E

USB 2.0 Hi-Speed and Audio Switches with Negative Signal Capability and ±15kV ESD

Maxim Integrated 

USB 2.0 Hi-Speed and Audio Switches with

Negative Signal Capability and ±15kV ESD

Detailed Description

The MAX14531E–MAX14534E are high ESD-protected

single DP3T switches that operate from a +2.7V to +5.5V

supply and are designed to multiplex USB 2.0 Hi-Speed

signals and AC-coupled analog signals. These switches

combine the low on-capacitance (CON) and low on-resis-

tance (RON) necessary for high-performance switching

applications. These devices also meet the requirements

for USB low-speed and full-speed signaling. The nega-

tive signal capability of all three channels allows signals

below ground to pass through without distortion.

Analog Signal Levels

The MAX14531E–MAX14534E are bidirectional, allow-

ing UAX_, UAY_, UAZ_, and COM_ to be configured as

either inputs or outputs. Note that UAX_, UAY_, and

UAZ_ are only protected against ESD up to ±2kV

(Human Body Model) and may require additional ESD

protection if used as outputs. These devices feature a

charge pump that generates a negative supply to allow

analog signals as low as -2.0V applied to UAX_, UAY_,

UAZ_, or COM_. The negative charge pump is only

active when the part is enabled (CB0 or CB1 = 1).

Connect negative signals to UAX_, UAY_, UAZ_, or

COM_ only when the device is enabled.

VBUS Detection

The MAX14531E–MAX14534E feature a VBUS detec-

tion input (CB0) that connects COM_ to UAX_ when

VCB0 exceeds the VBUS detection threshold (VVBDET)

(see the Functional Diagram/Truth Table). Note that the

MAX14531E requires an external pulldown resistor

when using this function.

Digital Control Inputs

The MAX14531E–MAX14534E provide control logic

inputs, CB0 and CB1, to control the switch position as

shown in the Functional Diagram/Truth Table. Drive

CB_ rail-to-rail to minimize power consumption.

Shutdown Mode

The MAX14531E–MAX14534E feature a shutdown

mode to reduce the supply current to less than 1µA and

place the switches in high impedance. Drive both CB0

and CB1 low to place the devices in shutdown mode

(see the Functional Diagram/Truth Table.)

Click-and-Pop Suppression

The switched 100Ω shunt resistors on the MAX14532E/

MAX14534E automatically discharge any capacitance

at the UAZ_ (MAX14532E) or UAY_ and UAZ_

(MAX14534E) inputs when they are unconnected from

COM_ (see the Functional Diagram/Truth Table). This

reduces audio click-and-pop sounds that may occur

when switching to audio sources.

Applications Information

Extended ESD Protection

ESD-protection structures are incorporated on all pins

to protect against electrostatic discharges up to ±2kV

(Human Body Model) encountered during handling and

assembly. COM1 and COM2 are further protected

against ESD up to ±15kV (Human Body Model) without

damage. The ESD structures withstand high ESD both

in normal operation and when the device is powered

down. After an ESD event, the MAX14531E–

MAX14534E continue to function without latchup.

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 4 shows the Human Body Model, and Figure 5

shows the current waveform it generates when discharged

into a low impedance. This model consists of a 100pF

capacitor charged to the ESD voltage of interest that is

then discharged into the device through a 1.5kΩ resistor.

RC

1MΩ

RD

1500Ω

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

HIGH-

VOLTAGE

DC

SOURCE

Cs

100pF

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

IP 100%

90%

AMPERES

36.8%

10%

0

0 tRL

Ir

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

TIME

tDL

CURRENT WAVEFORM

Figure 4. Human Body ESD Test Model

Figure 5. Human Body Current Waveform

4 _______________________________________________________________________________________

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