MIC2550A Datasheet, PDF (1/11 Pages) Micrel Semiconductor – Universal Serial Bus Transceiver

MIC2550A
Micrel, Inc.
MIC2550A
Universal Serial Bus Transceiver
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_BUS. This allows the system interface to operate at its
core voltage without addition of buffering logic and also
reduce system operating current.
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
Pb-Free
MIC2550ABTS MIC2550AYTS
MIC2550ABML MIC2550AYML
Package
14-Pin TSSOP
16-Pin MLF™
System Diagram
System
Supply Voltage
0.47µF
System
Interface
GND
MIC2550A
VIF VTRM
SPD VBUS
OE# D+
RCV D–
VP
D–
VM
SUS
GND
1.5k
1µF
LOW
SPEED
R_S
24Ω
R_S
24Ω
1µF min
10µF max
HIGH
SPEED
V_BUS
D+
D–
GND
USB
Interface
Connector
Cooper Electronics Technologies
41206ESDA SurgX^
(See “Applications Information”
for additional suppliers.)
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 [phone] • fax + 1 [phone] • http://www.micrel.com
March 2005
1
M9999-031805