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
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 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
MIC2551ABTS
MIC2551ABML
Package
14-Pin TSSOP
16-Pin MLF™
Typical Application
System
Supply Voltage
VCC GPIO
MIC2551A
VIF
CON
OE#
RCV
VP
VM
SPD
SUS
GND
VTRM
VBUS
VPU
V
BUS
R
S
20Ω/±1%
USB SIE
Controller
1.5k
D+
D–
R
S
20Ω/±1%
1.0µF (min)
10µF (max)
1µF
D+
D–
GND
USB
Port
41206ESDA SurgX
(See “Applications Information”
for additional suppliers.)
Typical Application Circuit
Micro
LeadFrame and MLF are trademarks of Amkor Technology.
SurgX is a registered trademark of Cooper Electronics Technologies.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2004
1
M9999-051004
MICREL [ MICREL SEMICONDUCTOR ]
