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MAX13481E/MAX13482E/MAX13483E

±15kV ESD-Protected USB Transceivers with

External/Internal Pullup Resistors

8 _______________________________________________________________________________________

Detailed Description

The MAX13481E/MAX13482E/MAX13483E ±15kV ESD-

protected USB-compliant transceivers convert single-

ended or differential logic-level signals to USB signals,

and USB signals to single-ended or differential logic

signals. These devices fully comply to USB 2.0 when

operating at full-speed (12Mbps), and operate with V

as low as 1.6V, ensuring compatibility with low-voltage

ASICs. Integrated ±15kV ESD-circuitry protection pro-

tects D+ and D- bus connections.

The MAX13481E/MAX13483E require an external 1.5kΩ

pullup resistor to V

TRM

for full-speed operation. The

MAX13481E requires an external 1.5kΩ pullup resistor

and feature an active-low enumeration function that

connects a +3.3V voltage at VPU. The MAX13482E fea-

tures an active-low enumeration function that connects

a 1.5kΩ pullup resistor at VPUR for full-speed opera-

tion. The MAX13482E/MAX13483E also provide a bus

detect (BD) output that asserts high when V

BUS

> 3.6V.

Applications Information

Power-Supply Configurations

Normal Operating Mode

Connect V

and V

BUS

to system power supplies (Table 1).

Connect V

to a +1.6V to +3.6V supply. Connect V

BUS

to a +4.0V to +5.5V supply or to the V

BUS

connector.

Alternatively, these parts can derive power from a sin-

gle Li+ cell. Connect the battery to V

BUS

. V

TRM

remains

above +3.0V for V

BUS

as low as +3.1V. Additionally, the

devices can be powered by an external +3.3V ±10%

voltage regulator. Connect V

BUS

and V

TRM

to an exter-

nal +3.3V voltage regulator. V

BUS

no longer consumes

current to power the internal linear regulator in this con-

figuration. The bus detect function (BD) on the

MAX13482E and MAX13483E does not function when

the device is powered this way.

Disable Mode

Connect V

BUS

to a system power supply and leave V

unconnected or connect to GND. D+ and D- enter a tri-

state mode and V

BUS

(or V

BUS

and V

TRM

) consumes

less than 20µA of supply current. D+ and D- withstand

external signals up to +5.5V in disable mode (Table 2).

BUS

(V) V

TRM

(V) V

(V) CONFIGURATION NOTES

+4.0 to +5.5 +3.0 to +3.6 output +1.6 to +3.6 Normal mode —

+4.0 to +5.5 +3.0 to +3.6 output GND or floating Disable mode Table 2

GND or floating High Z +1.6 to +3.6 Sharing mode Table 2

+3.1 to +4.5 +3.0 to +3.6 output +1.6 to +3.6 Battery supply

+3.0 to +3.6 +3.0 to +3.6 input +1.6 to +3.6

Voltage regulator supply

—

Table 1. Power-Supply Configuration

INPUTS/OUTPUTS DISABLE MODE SHARING MODE

BUS

/ V

TRM

4V to 5.5V Floating or connected to GND

Floating or connected to GND 1.6V to 3.6V input

D+ and D- High impedance High impedance

For OE = low, high impedance

VP and VM Invalid*

For OE = high, output logic high

RCV Invalid* Undefined

(MAX13482E/MAX13483E)

Invalid* Low

Table 2. Disable-Mode and Sharing-Mode Connection

*High impedance or logic low

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 18 19

MAX13481E/MAX13482E/MAX13483E 1

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