®
USB6Bx
DATA LINES PROTECTION
Application Specific Discretes
A.S.D.
APPLICATIONS
Where transient overvoltage protection in sensi-
tive equipment is required, such as:
- Universal Serial Bus ports
- RS-423 interfaces
- RS-485 interfaces
- ISDN equipment
- T1/E1 line cards
- HDSL / ASDL interfaces
FEATURES
n
Full diode bridge with integrated clamping protection
n
Breakdown voltage : VBR = 6V min.
n
Peak pulse power dissipation : P
PP
= 500W (8/20µs)
n
Very low capacitance, compatible with high debit
data or signal rates.
DESCRIPTION
In order to prevent fast transients from leading
to severe damages in a high speed data sys-
tem, a specific protection has been developed
by STMicroelectronics.
The
USB6Bx
protects the two input lines
against overvoltage. Besides, this device also
keeps the power rails in a safe limit thanks to
the integrated Transil diode.
BENEFITS
n
SO8
DIL8
n
n
n
Provides protection for each line and between
the supply voltage and GND : 25A , 8/20µs.
High ESD protection level : up to level 3 per
MIL STD 883C-Method 3015-6
Separated inputs and outputs (so-called 4-point
structure) to improve ESD susceptibility.
Comprehensive package pin-out for immediate
implementation.
FUNCTIONAL DIAGRAM
COMPLIES WITH THE FOLLOWING STANDARDS:
MIL STD 883C - Method 3015-6
class 3
C = 100 pF
R = 1500
Ω
3 positive strikes and 3 negative strikes (F = 1 Hz)
IEC-1000-4-2 level 4
15 kV (air discharge)
8 kV (contact discharge)
TM: ASD and TRANSIL are trademarks of ST Microelectronics.
Vcc
I/01
I/02
GND
Vcc
I/01
I/02
GND
August 1999 Ed : 5A
1/9
STMICROELECTRONICS [ STMICROELECTRONICS ]
