MIC2550 Datasheet, PDF (1/8 Pages) Micrel Semiconductor – Universal Serial Bus Transceiver Advance Information

MIC2550
Micrel
MIC2550
Universal Serial Bus Transceiver
Advance Information
General Description
The MIC2550 is a single-chip transceiver that complies with
the physical layer specifications for Universal Serial Bus
(USB).
The MIC2550 supports full-speed (12Mb/s) dual supply volt-
age operation (patent pending) and low-speed (1.5Mb/s)
operation.
A unique dual supply voltage operation allows the MIC2550
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 1.1
• Operation down to 2.5V
• Dual supply voltage operation
• Supports full-speed (12Mb/s) and
low-speed (1.5Mb/s) operation
• Speed-select termination supply
• Very low power consumption meets
USB suspend-current requirements
• Small 14-pin TSSOP
Applications
• Personal digital assistants (PDA)
• Palmtop computers
• Cellular telephones
Ordering Information
Part Number
MIC2550BTS
Junction Temp. Range
–40°C to +85°C
Package
14-Pin TSSOP
System Diagram
System
Supply
Voltage
0.47µF
System
Interface
GND
MIC2550
VIF VTRM
SPD VBUS
OE# D+
RCV D–
VP
VM
SUS
GND
1.5k
LOW
SPEED
24Ω
24Ω
1µF
HIGH
SPEED
V_BUS
D+
D–
GND
USB
Interface
Connector
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
October 4, 1999
1
MIC2550