MIC2550A
General Description
The MIC2550A is a single-chip transceiver that complies with
the physical layer specifications for Universal Serial Bus
(USB).
The MIC2550A supports full-speed (12Mbps) and low-speed
(1.5Mbps) operation and introduces superior edge rate con-
trol to produce crisper eye diagrams. As a result, the task of
passing USB compliance testing is made easier.
A unique, patented, dual supply voltage operation allows the
MIC2550A to reference the system I/F I/O signals to a supply
voltage down to 2.5V while independently powered by the
USB V
. This allows the system interface to operate at its
BUS
core voltage without addition of buffering logic and also
reduce system operating current.
System Diagram
System
Supply Voltage
0.47µF
System
Interface
GND
MicroLeadFrame and MLF are trademarks of Amkor Technology.
SurgX is a registered trademark of Cooper Electronics Technologies.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2005
Universal Serial Bus Transceiver
Features
• Compliant to USB Specification Revision 2.0 for
low-speed (1.5Mbps) and full-speed (12Mbps) operation
• Compliant to IEC-61000-4.2 (Level 2)
• Operation down to 2.5V
• Dual supply voltage operation
• Integrated speed-select termination supply
• Very low power consumption meets USB suspend-
current requirements
• Small 14-pin TSSOP and 16-pin MLF™ packages
Applications
• Personal digital assistants (PDA)
• Palmtop computers
• Cellular telephones
Ordering Information
Part Number
Standard
MIC2550ABTS
MIC2550ABML
1.5k
MIC2550A
VIF
VTRM
LOW
SPEED
SPD
VBUS
R
S
OE#
D+
24Ω
RCV
D–
R
S
VP
D–
24Ω
VM
1µF
SUS
GND
1µF min
10µF max
1
Micrel, Inc.
MIC2550A
Pb-Free
Package
MIC2550AYTS
14-Pin TSSOP
MIC2550AYML
16-Pin MLF™
HIGH
SPEED
V
BUS
D+
USB
D–
Interface
Connector
GND
Cooper Electronics Technologies
41206ESDA SurgX
(See “Applications Information”
for additional suppliers.)
M9999-031805