7
© 2012 Semtech Corporation
www.semtech.com
PRELIMINARY
PROTECTION PRODUCTS
RClamp2656P
Applications Information
Device Connection and Layout Options for Protecting
One USB Port
The RClamp2656P is optimized for protection of USB
ports. Low capacitance protection is provided for the
USB data (DM, DP) and USB ID pins. The maximum
capacitance on these lines is <0.5pF for maximum
signal integrity. USB Data and ID lines are connected
at pins 2, 3, and 4. These inputs are referenced to
an internal 5 volt TVS protection device. When the
voltage on these lines exceed 5 volts, the TVS will
conduct. Pin is connected to the USB voltage bus
(VBus). This device will conduct when the voltage on
the bus exceeds 26 volts. Ground is provided at pins
5, 6, and the center tabs. Multiple micro vias
connected to ground are recommended for best ESD
performance. This will reduce parasitic inductance in
the ground path and minimize the clamping voltage
seen by the protected device.
Figure 1 - Pin Configuration (Top View)
VBus
D+
D-
ID
GND
GND
GND
GND
23 4
5, 6,
26V
1
Tabs
5V
Figure 2 - Schematic
