MAX3346E Просмотр технического описания (PDF) - Maxim Integrated

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MAX3346E

±15kV ESD-Protected USB Transceiver in UCSP

Maxim Integrated 

±15kV ESD-Protected USB Transceiver

in UCSP

PIN

TSSOP

UCSP

7

B2

8

A2

9

A3

10

A4

11

B4

12

C4

13

D4

14

D3

—

B3, C3

NAME

SUSP

SPEED

VCC

GND

D-

D+

VTRM

VL

—

Pin Description (continued)

INPUT/

OUTPUT

FUNCTION

Input

Suspend Input. Drive SUSP low for normal operation. Force SUSP high for low-

power state. In low-power state RCV is low, D+/D- are high impedance if OE is

floating, and VP/VM are active outputs.

Input

USB Transmission Speed Select Input. If SPEED is forced high, full speed

(12Mbps) is selected and the internal 1.5kΩ pullup resistor is connected to D+.

If SPEED is forced low, low speed (1.5Mbps) is selected and the internal 1.5kΩ

pullup resistor is connected to D-.

Power

Power

Input/

Output

Input/

Output

Power

Power

—

USB-Side Power-Supply Input. Connect VCC to the incoming USB power supply.

Bypass VCC to GND with a 1µF ceramic capacitor.

Ground

USB Differential Data Input/Output. Connect to the USB’s D- signal through a

24.3Ω ±1% resistor.

USB Differential Data Input/Output. Connect to the USB’s D+ signal through a

24.3Ω ±1% resistor.

Regulated Output Voltage. 3.3V output derived from the VCC input. Bypass

VTRM to GND with a 1µF (or more) low-ESR capacitor, such as ceramic or

plastic film types.

System-Side Power-Supply Input. Connect to the system’s logic-level power

supply, 1.65V to 3.6V. Bypass to GND with a 0.1µF capacitor.

Not populated. The solder sphere is omitted from these locations (see the

Package Information).

Detailed Description

The MAX3346E is a bidirectional transceiver that con-

verts single-ended or differential logic-level signals to

differential USB signals, and converts differential USB

signals to single-ended or differential logic-level sig-

nals. The MAX3346E includes an internal 1.5kΩ pullup

resistor that can be connected to either D+ or D- for

full-speed or low-speed operation (see the Functional

Diagram). The MAX3346E can be energized without

concern about power-supply sequencing. Additionally,

the USB I/O, D+ and D-, are ESD protected to ±15kV.

The MAX3346E can get its USB-side power, VCC,

directly from the USB connection, and can operate with

system-side power, VL, down to 1.65V and still meet the

USB physical layer specifications. The MAX3346E sup-

ports both full-speed (12Mbps) and low-speed

(1.5Mbps), USB specification 1.1 operation.

The MAX3346E has an enumerate feature that works

when power is on. Driving ENUM low disconnects the

internal 1.5kΩ pullup resistor from both D+ and D-,

reenumerating the USB. This is useful if changes in com-

munication protocol are required while power is applied,

and while the USB cable is connected.

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