MIC2551A-2.5
Micrel, Inc.
MIC2551A-2.5
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. This in turn, eases
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
BUS
. This reduces system operating current
and allows the system to operate at its core voltage without
additional buffering logic.
MIC2551A-2.5 is differentiated from MIC2551A by a smaller
space saving MLF™ package (2.5mm × 2.5mm) and ±15kV
ESD protection which eliminates the need for separate ESD
protection devices on the D+, D- data lines.
Data sheets and support documentation can be found on
Micrel's web site at www.micrel.com.
Features
• ±15kV ESD protection on V
BUS
, D+ and D-
• Smaller 2.5mm × 2.5mm MLF™ package
• USB 1.1 and 2.0 compliant transceiver (full speed -
12Mbs and low speed - 1.5Mbps) operation
• 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
• No power supply sequencing requirements
• Software controlled enumeration
Applications
•
•
•
•
PDAs
Palmtops
Cell phones
PC peripherals
Ordering Information
Part Number
MIC2551AYML25
Junction Temp. Range
-40°C to +85°C
Package - Pb Free
2.5mm × 2.5mm MLF™
Typical Application
MIC2551A
Transceiver
V I/O
VIF
CON
OE#
RCV
VP
VM
SPD
GND
SUS
GND
VTRM
VPU
VBUS
D+
D–
1.5 k
20Ω 1%
20Ω 1%
1.0µF
V
BUS
D+
D–
10µF
GND
USB
Port
USB
Controller
Typical Application Circuit
MicroLeadFrame and MLF are trademarks of Amkor Technology.
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 2006
1
M9999-031306
MICREL [ MICREL SEMICONDUCTOR ]
