MAX3456E datasheet(10/19 Pages) MAXIM

Part #	MAX3456E

Description	±15kV ESD-Protected USB Transceivers

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Manufacturer	MAXIM [Maxim Integrated Products]

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±15kV ESD-Protected USB Transceivers

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Detailed Description

The MAX3453E–MAX3456E USB-compliant transceivers

convert single-ended or differential logic-level signals to

USB signals, and USB signals to single-ended or differ-

ential logic-level signals. The MAX3453E fully complies

with full-speed (12Mbps) operation under USB specifica-

tion 2.0. The MAX3454E–MAX3456E fully comply with

USB specification 1.1, and full-speed (12Mbps) and low-

speed (1.5Mbps) operation under USB specification 2.0.

The MAX3453E–MAX3456E operate with VL as low as

+1.65V, ensuring compatibility with low-voltage ASICs.

The MAX3453E–MAX3456E derive power from the USB

host (VBUS) or from a single-cell Li+ battery

(MAX3454E/MAX3456E) connected to VBUS or from a

+3.3V regulated supply connected to VBUS and VTRM.

The MAX3453E–MAX3456E meet the physical layer

specifications for logic-level supply voltages (VL) from

+1.65V to +3.6V. Integrated ±15kV ESD protection safe-

guards the D+ and D- USB I/O ports.

The MAX3453E/MAX3454E feature an enumerate func-

tion providing an internal 1.5k

Ω pullup resistor from D+

(MAX3453E/MAX3454E) or D- (MAX3454E only) to

VTRM. The enumerate function disconnects the 1.5k

Ω

pullup resistor, allowing the MAX3453E/MAX3454E to

simulate a bus disconnect while powered and connect-

ed to the USB cable. The MAX3453E/MAX3455E fea-

ture a bus-detect output (BD) that asserts high if VBUS

> +4V. BD asserts low if VBUS < +3.6V. The

MAX3455E/MAX3456E require external pullup resistors

from either D+ or D- to VTRM to utilize the appropriate

bus speed. The MAX3456E is pin-for-pin compatible

with the Micrel MIC2550A.

Applications Information

Power-Supply Configurations

Normal Operating Mode

Connect VL and VBUS to system power supplies (Table 1).

Connect VL to a +1.65V to +3.6V supply. Connect VBUS

to a +4.0V to +5.5V supply. Alternatively, the MAX3454E/

MAX3456E can derive power from a single Li+ battery.

Connect the battery to VBUS.

Additionally, the MAX3454E/MAX3456E can derive

power from a +3.3V ±10% voltage regulator. Connect

VBUS and VTRM to an external +3.3V voltage regulator.

VBUS no longer consumes current to power the internal

linear regulator in this configuration.

Table 1. Power-Supply Configurations

VBUS (V)

VTRM (V)

VL (V)

CONFIGURATION

NOTES

4.0 to 5.5

3.0 to 3.6 output

1.65 to 3.6

Normal mode

—

3.1 to 4.5

3.0 to 3.6 output

1.65 to 3.6

Battery supply

MAX3454E/MAX3456E

3.0 to 3.6

3.0 to 3.6 input

1.65 to 3.6

Voltage regulator supply

MAX3454E/MAX3456E

GND or floating

High-Z

1.65 to 3.6

Sharing mode

Table 2

3.0 to 5.5

High-Z

GND or floating

Disable mode

Table 2

*High impedance or low.

**High or low.

INPUTS/OUTPUTS

DISABLE MODE

SHARING MODE

VBUS/VTRM

+3.0V to +5.5V / High Impedance

• Floating or connected to GND

(MAX3453E/MAX3454E/MAX3456E) / High Impedance

• < 3.6V (MAX3453E/MAX3455E) / High Impedance

VL

Floating or connected to GND

1.65V to 3.6V input

D+ and D-

High impedance

High impedance for OE = low

VP and VM

Invalid*

High for OE = high

RCV

Invalid*

Undefined**

SPD (MAX3454E–MAX3456E),

SUS, OE, ENUM

(MAX3453E/MAX3454E)

High impedance

BD (MAX3453E/MAX3455E)

Invalid*

Low

Table 2. Disable-Mode and Sharing-Mode Connections

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