SN65220

SN65240

SN75240

SLLS266F − FEBRUARY 1997 − REVISED JULY 2004

USB PORT TRANSIENT SUPPRESSORS

YZB-4

DBV-6

PW-8

P-8

FEATURES

Circuits from Noise Transients

− 15-kV Human Body Model

− 2-kV Machine Model

DESCRIPTION

The SN65220 is a single transient voltage suppressor and

the SN65240 and SN75240 are dual transient voltage

suppressors designed to provide electrical noise transient

protection to Universal Serial Bus (USB) 1.1 ports. Note

that the input capacitance of the device makes it

unsuitable for high-speed USB 2.0 applications.

Any cabled I/O can be subjected to electrical noise

transients from various sources. These noise transients

can cause damage to the USB transceiver and/or the USB

ASIC if they are of sufficient magnitude and duration.

USB ports are typically implemented in 3-V or 5-V digital

CMOS with very limited ESD protection. The SN65220,

SN65240, and SN75240 can significantly increase the

port ESD protection level and reduce the risk of damage

to the circuits of the USB port.

The IEC1000-4-2 ESD performance of the SN65220,

SN65240, and SN75240 is measured at the system level.

Therefore, system design impacts the results of these

tests. A high compliance level may be attained with proper

board design and layout.

APPLICATIONS

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

www.ti.com

Copyright

 1997 − 2003, Texas Instruments Incorporated

A1

A2

B2

B1

A

GND

GND

B

SN65220YZB

(Size: 925

mm x 925 mm +6 mm)

(TOP VIEW)

3

2

4

6

(TOP VIEW)†

1

NC

GND

NC

A

B

SN65220DBV

GND

5

NC − No internal connection

1

2

3

4

8

7

6

5

GND

C

GND

D

A

GND

B

GND

SN65240P, SN65240PW

SN75240P, SN75240PW

(TOP VIEW)

†When read horizontally, Pin 1 is the bottom left pin.

NOTE A:

Typical current versus voltage curve was derived

using the IEC 1.2/50-

µs surge waveform.

CURRENT vs VOLTAGE

−2.5

−5

−7.5

−10

−5

0

0

2.5

5

5

10

15

Voltage − V

−10

7.5

A or C

GND

B or D

(One Suppressor Shown)

NOTE: All GND terminals should be connected to ground.

EQUIVALENT SCHEMATIC DIAGRAM