ECLAMP2522P.TCT Semtech, ECLAMP2522P.TCT Datasheet - Page 4

• Manufacturer Part Number: ECLAMP2522P.TCT
• Description: EClamp ESD Protection For USB 1.1
• Manufacturer: Semtech

1 . 1 .
1 . 1 . Full-Speed Devices: For full-speed devices the
2 . 2 .
2 . 2 . Low-Speed Devices: : : : : For low speed devices the
Device Connection
The EClamp2522P is designed to provide termination,
EMI filtering and ESD protection for one USB port. The
device is connected as follows:
1 .
2 .
USB Port Design Considerations
The Universal Serial Bus (USB) specification requires
termination and filtering components for proper opera-
tion. In addition, an open USB socket is vulnerable to
hazardous ESD discharges in excess of 15kV. These
discharges can occur on the data lines or the voltage
bus. The EClamp2522P is an easily implemented
solution that is designed to meet the termination and
EMI filter requirements of the USB specification for low
speed and full speed devices. It also provides ESD
protection to IEC 61000-4-2, level 4.
USB line termination is achieved with series resistors
on both the D+ and D- lines. These resistors preserve
signal integrity by matching the cable impedance to
that of the differential driver. A 1.5k
is used to identify an upstream port on either the D+
(full speed devices) or the D- (low speed devices) data
line. TVS diodes provide ESD protection of both (D+
and D-) data lines and the voltage bus (V
integrated solution simplifies design and requires
minimal board space.
PROTECTION PRODUCTS
2007 Semtech Corp.
pull-up resistor is connected to the D+ line. Route
the D+ line from the connector to pin 2. Pin 5 is
connected to the D+ line of the IC. Route the D-
line from the connector to pin 3. Pin 4 is con-
nected to the D- line of the IC. Pin 1 is connected
to the voltage supply line (V
to the 3.3 Volt supply. The ground connection is
made to the center tab. For best results, use
multiple vias to the ground plane to reduce para-
sitic inductance.
pull-up resistor is connected to the D- line. Route
the D- line from the connector to pin 2. Pin 5 is
connected to the D- line of the IC. Route the D+
line from the connector to pin 3. Pin 4 is con-
nected to the D+ line of the IC. Pin 1 is connected
to the voltage supply line (V
to the 3.3 Volt supply. The ground connection is
made to the center tab. For best results, use
multiple vias to the ground plane to reduce para-
sitic inductance.
BUS
BUS
). Pin 6 is connected
). Pin 6 is connected
pull-up resistor
BUS
). This
4
Figure 1 - Pin Identification and Configuration
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