lx7202 Microsemi Corporation, lx7202 Datasheet - Page 3

• Manufacturer Part Number: lx7202
• Description: Emi Filter & Esd Protection For Up Stream Usb Ports
• Manufacturer: Microsemi Corporation

Copyright © 2002
Rev. 1.0d, 2007-04-11
USB 2.0 Full Speed specification for device termination,
EMI filtering and ESD protection. The RS resistor provides
the proper signal termination; the 47pF capacitor controls
the signal rise and fall slew; the TVS diodes protect the IC
from ESD damage; and the total capacitance and resistance
creates a low pass filter eliminating the high frequency
energy from the circuit. The LX7202 can configure the
upstream port for either Full-Speed or Low-Speed
operation. The figures below show the proper connection in
accordance with the USB specification.
The LX7202 meets the requirements of the USB v1.1 and
Transceiver
USB
TM
Host or Hub (downstream) port
Transceiver
Host
USB
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
cable
GND
4
5
6
LX7201
GND
V
BUS
D+
D-
Figure 2 – Connection for Full Speed Operation
C
R
C
S
A P P L I C A T I O N I N F O R M A T I O N
R
R
PD
R
S
PD
A P P L I C A T I O N C I R C U I T S
Figure 1 – Typical Application
V
1
3
2
BUS
Analgo Mixed Signal Group
®
Microsemi
V
D
D
BUS
IN
IN
EMI Filter & ESD Protection for Up Stream USB
1
2
3
F
transfer rate known as Full-Speed which requires a 1.5 kΩ
pull-up resistor to be connected to the D+ line. Slew rate
control is accomplished with 47pF attached to the
transceiver before the R
ULL
LX7202
The USB 2.0 specification offers a 12 Mbps data
R
PU
Voltage Supply (Vbus) is connected to Pin 1
Ground is connected to Pin 6
D+ from the connector is routed to Pin 3 (1.5 kΩ pull-up
resistor) and Pin 4 to the D+ line of the USB Transceiver
D- from the connector is routed to Pin 2 and Pin 5 to the
D- line of the USB Transceiver
S
PEED
V
Peripheral (upstream) port
BUS
1
2
3
P
D
6
5
4
RODUCTION
GND
D
D
EVICE
OUT
OUT
LX7202
R
PU
R
C
R
S
C
S
S
Ports
.
D
GND
6
5
4
ATA
Transceiver
GND
V
D-
D+
Peripheral
S
BUS
HEET
USB
Transceiver
LX7202-xx
USB
Page 3