PACUSBU-S Datasheet, PDF (3/6 Pages) ON Semiconductor – Upstream USB Port Terminator

PACUSBU−S
SPECIFICATIONS (Cont’d)
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
Symbol
R1
R1
R1
R2
C1
Parameter
Resistance R1 (PACUSB−U1 Only)
Resistance R1 (PACUSB−U2 Only)
Resistance R1 (PACUSB−U3 Only)
Resistance R2
Capacitance C1
I_LEAK
V_D1
Diode Leakage Current to GND
Diode Reverse−Biased Stand−Off
Voltage
Conditions
Measured at T_A = 25C
Measured at T_A = 25C
Measured at T_A = 25C
Measured at T_A = 25C
Measured at 1 MHz, 2.5 V DC,
T_A = 25C
At 3.3 V DC and T_A = 25C
I = 10 mA, T_A = 25C
Min
Typ
Max Units
12
15
18
W
26
33
40
W
18
22
26
W
1.2
1.5
1.8
kW
38
47
56
pF
1
100
nA
5.5
8.0
V
V_D2
V_ESD
V_CLAMP
Signal Clamp Voltage
Positive Clamp
Negative Clamp
In−system ESD Withstand Voltage
Human Body Model, MIL−STD−883,
Method 3015
IEC 61000−4−2, Contact Discharge
Method (I/O Pins)
IEC 61000−4−2, Contact Discharge
Method (V_3.3 Pin)
Clamping Voltage during ESD Discharge
Positive
Negative
@ 10 mA, T_A = 25C
@ 10 mA, T_A = 25C
(Note 1)
(Note 1)
(Note 1)
MIL−STD−883, Method 3015, 8 kV
(Note 1)
V
5.6
6.8
8.0
−1.2 −0.8 −0.4
kV
30
15
25
V
10
−5
1. ESD applied to input/output/V_3.3 pins with respect to GND, one at a time. Clamping voltage is measured at the opposite side of the EMI filter
to the ESD pin (i.e., if ESD is applied to pin 1, then clamping voltage is measured at pin 6). Unused pins are open.
APPLICATION INFORMATION
The PACUSB−U1/U2/U3 is targeted for upstream USB ports (peripherals). It provides series termination, EMI filtering, and
ESD protection for the two USB data lines D+ and D−.
The USB Specification revision 1.1 provides for two data rates:
 The Full Speed signaling bit rate at 12 Mbits per second, and
 The Low Speed signaling bit rate at 1.5 Mbits per second.
The speed is selected by connecting one of the data lines (D+ or D−) to a 3.3 V supply voltage via a 1.5 kW pull−up resistor
(R2).
Connections for Full Speed Operation
Full Speed devices have the pull−up resistor (R2) connected to the D+ data line, as shown in Figure 1. Pin1 is tied to the D+
line of the USB controller. Pin 6 is connected to the D+ line on the USB connector.
Connections for Low Speed Operation
Low Speed devices have the pull−up resistor (R2) connected to the D− data line, as shown in Figure 2. Pin 1 is tied to the
D− line of the USB controller; pin 6 is connected to the D− line on the USB connector.
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