AZC199-04C datasheet(6/10 Pages) AMAZING

6 / 10 page

AZC199-04C

Low Capacitance High ESD Level Protection Array

For High Speed I/O Port

Revision 2011/07/30

www.amazingIC.com

C. Application

AZC199-04C is designed for protecting high

speed I/O ports from very high over-voltage

caused by Electrostatic Discharging (ESD). Thus,

a lot of kinds of high speed I/O ports can be the

applications of AZC199-04C, especially, the VGA

and

DVI

ports

with

the

ESD

spec.

contact-15kV, Class-C above.

The VGA Output Port

Fig. 4 shows the schematic of ESD protection

design for a VGA output port on a host system,

(e.g. the source, such as MB, NB, Media

player…), where two AZC199-04C are used. The

AZC199-04C

has

been

integrated

with

back-drive protection diode for preventing the

back-drive current to occur. Thus, no extra

BAV70 for preventing the back-drive current to

occur is needed.

The back-drive current occurs as shown in

Fig, 5. When the source stays at OFF state, at

the source connector, the VGA5V pin was

wished to be at zero potential. At this moment, if

without

the

integrated

back-drive

current

protection diode, the display device stays at ON

state, and the pulled high signals will produce a

current back drive to the source’s VGA5V power

plate as shown in Fig. 5. This back drive current

may make VGA5V be not at zero potential, which

may lead system to an abnormal state. Therefore,

it should be eliminated, and the integrated

back-drive protection diode can eliminate this

current.

The VGA Input Port

In contrast with the design for a VGA output

port, the schematic of ESD protection design for

a VGA input port on a display system is shown in

Fig. 6. In most of VGA input circuit designs, there

are always two power supplies, one is from the

connector’s DSUB-5V pin which potential comes

from another VGA output port, the other is from

the own power supply circuit of the VGA input

port, system 5V. The VDD pin of AZC199-04C is

directly connected to the connector’s DSUB-5V

pin to block the ESD event which comes from the

DSUB-5V pin.

VGA5V

DDCA_SDA

VSYNC

HSYNC

DDCA_SCL

VGA5V

Green

Red

Detect

Blue

Red

Green

Blue

DDCA_SCL

DDCA_SDA

VSYNC

HSYNC

DIG_GND

Red_GND

Green_GND

Blue_GND

VGA5V

GND

15-pin

VGA connector

Detect

Video

Filter

Ω

Red

Video

Filter

Ω

Green

Video

Filter

Ω

Blue

VSYNC

HSYNC

DDC_Data

DDC_CLK

Detect

ESD Protection Design

System_5V

VGA5V

Fig. 4

The ESD design for a VGA OUTPUT port which two AZC199-04C are used.

AZC199-04C Folha de dados(PDF) 6 Page - AMAZING Microelectronic Corp.

AZC199-04C Folha de dados(HTML) 6 Page - AMAZING Microelectronic Corp.

Html Pages

1 2 3 4 5 6 7 8 9 10

Folha de dados Download

Ligação URL