May 2004

1

M9999-051004

MIC2551A

Micrel

MIC2551A

USB Transceiver

General Description

The MIC2551A is a single chip transceiver that complies with

the physical layer specifications of the Universal Serial Bus

(USB) 2.0. It supports both full speed (12Mbps) and low

speed (1.5Mbps) operation and introduces superior edge

rate control, producing crisper eye diagrams, which ease the

task of passing USB compliance testing.

A unique, patented, dual supply voltage operation allows the

MIC2551A to reference the system I/F I/O signals to a supply

voltage down to 1.6V while independently powered by the

USB V

core voltage without addition of buffering logic and also

reduce system operating current.

Typical Application

System

Supply Voltage

USB SIE

Controller

VIF

OE#

RCV

VP

VM

D–

D+

VBUS

VTRM

GND

D–

D+

USB

Port

GND

GPIO

MIC2551A

SPD

1.0

µF (min)

10

µF (max)

(See “Applications Information”

for additional suppliers.)

VCC

SUS

VPU

20

Ω/±1%

20

Ω/±1%

1.5k

1

µF

CON

Typical Application Circuit

Features

• Compliant to USB Specification Revision 2.0 for full

speed (12Mbs) and low speed (1.5Mbps) operation

• Compliant to IEC-61000-4.2 (Level 3)

• Separate I/O supply with operation down to 1.6V

• Integrated speed select termination supply

• Very-low power consumption to meet USB suspend-

current requirements

• Small TSSOP and MLF™ packages

• No power supply sequencing requirements

• Software controlled re-enumeration

Applications

• PDAs

• Palmtops

• Cell phones

Ordering Information

Part Number

Package

MIC2551ABTS

14-Pin TSSOP

MIC2551ABML

16-Pin MLF™

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

SurgX is a registered trademark of Cooper Electronics Technologies.