PACUSB-U2R datasheet(3/6 Pages) ONSEMI

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PACUSBU

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SPECIFICATIONS (Cont’d)

Table 4. ELECTRICAL OPERATING CHARACTERISTICS

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Resistance R1 (PACUSB−U1 Only)

Measured at TA = 25C

Resistance R1 (PACUSB−U2 Only)

Measured at TA = 25C

Resistance R1 (PACUSB−U3 Only)

Measured at TA = 25C

Resistance R2

Measured at TA = 25C

1.2

1.5

1.8

Capacitance C1

Measured at 1 MHz, 2.5 V DC,

TA = 25C

ILEAK

Diode Leakage Current to GND

At 3.3 V DC and TA = 25C

100

VD1

Diode Reverse−Biased Stand−Off

Voltage

I = 10 mA, TA = 25C

5.5

VD2

Signal Clamp Voltage

Positive Clamp

Negative Clamp

@ 10 mA, TA = 25C

5.6

−1.2

6.8

−0.8

8.0

−0.4

VESD

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 (V3.3 Pin)

(Note 1)

30

15

25

VCLAMP

Clamping Voltage during ESD Discharge

Positive

Negative

MIL−STD−883, Method 3015, 8 kV

(Note 1)

−5

1. ESD applied to input/output/V3.3 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 k

W 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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