ST USBUF01P6 User Manual
IPAD™ EMI filter and line termination for USB upstream ports
Features
■ Monolithic device with recommended line
termination for USB upstream ports
■ Integrated R
bypassing capacitors.
■ Integrated ESD protection
■ Small package size
Benefits
■ EMI / RFI noise suppression
■ Required line termination for USB upstream
ports
■ ESD protection exceeding
IEC 61000-4-2 level 4
■ High flexibility in the design of high density
boards
■ Tailored to meet USB 2.0 standard (low speed
and full speed data transmission)
series termination and Ct
t
USBUF01P6
SOT-666IP
Figure 1. Functional diagram (top view)
3.3 V
Rp
D1
GND
D2
Rt
Ct
Rt
Ct
D4
3.3 V
D3
Complies with the following standards:
Description
■ IEC 61000-4-2 level4:
– 15 kV (air discharge)
– 8 kV (contact discharge)
■ MIL STD 883E-Method 3015-7:
– Class 3, C = 100 pF, R = 1500 Ω
– 3 positive strikes, 3 negative strikes
(F = 1 Hz)
Applications
EMI Filter and line termination for USB upstream
ports on:
■ USB Hubs
■ PC peripherals
February 2010 Doc ID 9883 Rev 7 1/9
The USB specification requires upstream ports to
be terminated with pull-up resistors from the D+
and D- lines to V
. For the implementation of
bus
USB systems, the radiated and conducted EMI
should be kept within the required levels as stated
by the FCC regulations. In addition to the
requirements of termination and EMC
compatibility, the computing devices are required
to be tested for ESD susceptibility.
The USBUF01P6 provides the recommended line
termination while implementing a low pass filter to
limit EMI levels and providing ESD protection
which exceeds IEC 61000-4-2 level 4 standard.
The device is packaged in a SOT-666, which is
the smallest available lead-frame package (45%
smaller than the standard SOT323).
TM: IPAD is a trademeark of STMicroelectronics
www.st.com
9
Characteristics USBUF01P6
1 Characteristics
Table 1. Absolute maximum rating (T
Symbol Parameter Value Unit
amb
= 25 °C)
IEC 61000-4-2 air discharge
V
ESD discharge
PP
IEC 61000-4-2 contact discharge
MIL STD 883E - Method 3015-7
Junction temperature 150 °C
T
j
T
Table 2. Electrical characteristics (T
Symbol Parameter
V
V
Storage temperature range -55 to +150 °C
stg
Maximum lead temperature for soldering during 10 s at 5 mm for case 260 °C
T
L
T
Operating temperature range -40 to + 85 °C
op
= 25 °C)
amb
I
Stand-off voltage
V
I
I
RM
Breakdown voltage
BR
Clamping voltage
CL
Leakage current
RM
Peak pulse current
PP
V
V
CL
BR
I
F
V
V
RM
F
I
RM
αT Voltage temperature coefficient
Forward voltage drop
V
F
Slope = 1/Rd
I
PP
Rd Dynamic resistance
Symbol Test conditions Min. Typ. Max. Unit
± 16
± 9
± 25
kV
V
V
I
BR
I
RM
R
t
R
p
C
t
= 1 mA 6 10 V
R
VRM = 3.3 V per line 500 nA
Tolerance ± 10% 33 Ω
Tolerance ± 10% 1.5 kΩ
Tolerance ± 20% 47 pF
2/9 Doc ID 9883 Rev 7
USBUF01P6 Technical information
t
t
2 Technical information
Figure 2. USB standard requirements
3.3V
1.5k
Rt
D+
D-
3.3V
1.5k
D+
D-
Ct
Rt
Ct
Rt
Ct
Rt
Ct
Full-speed USB
Transceiver
Hub 0 or
Full-speed function
Low-speed USB
Transceiver
Hub 0 or
Low-speed function
Full-speed or
Low-speed USB
Transceiver
Host or
Hub port
Full-speed or
Low-speed USB
Transceiver
Host or
Hub port
2.1 Application example
Rt
Ct
Ct
Ct
Ct
D+
Rt
15k
15k
Rt
Rt
15k
15k
Twisted pair shielded
Zo = 90ohms
D-
5m max
FULL SPEED CONNECTION
D+
Untwisted unshielded
3m max
D-
LOW SPEED CONNECTION
Figure 3. Implementation of ST solutions for USB ports
Downstream port
D+
Gnd
D-
Host/Hub USB por transceivert
Downstream port
D+
Gnd
D-
Host/Hub USB por transceivert
D+ in
Gnd
D- in
D+ in
Gnd
D- in
USBDF01W5
Rt
Ct
Rd
Rd
Ct
Rt
USBDF01W5
Rt
Ct
Rd
Rd
Ct
Rt
D+ out
D-
D- out
D+
D-
CABLE
D+
FULL SPEED CONNECTION
D+ out
D-
D- out
D+
D-
CABLE
D+
LOW SPEED CONNECTION
USBUF01P6
Ct
USBUF01P6
Ct
D2
Rt
D3
D2
Rt
D3
GND
3.3V
GND
3.3V
Upstream por
D+
D1
Ct
Rt
3.3 V
Rp
D4
Peripheral transceiver
D-
Upstream por
D+
D1
Ct
Rt
3.3 V
Rp
D4
Peripheral transceiver
D-
Doc ID 9883 Rev 7 3/9
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